diff --git a/DeDRM_plugin/androidkindlekey.py b/DeDRM_plugin/androidkindlekey.py
index 971d7c3..b8b1a31 100755
--- a/DeDRM_plugin/androidkindlekey.py
+++ b/DeDRM_plugin/androidkindlekey.py
@@ -41,71 +41,6 @@ except ImportError:
 
 # Routines common to Mac and PC
 
-# Wrap a stream so that output gets flushed immediately
-# and also make sure that any unicode strings get
-# encoded using "replace" before writing them.
-class SafeUnbuffered:
-    def __init__(self, stream):
-        self.stream = stream
-        self.encoding = stream.encoding
-        if self.encoding == None:
-            self.encoding = "utf-8"
-    def write(self, data):
-        if isinstance(data,str) or isinstance(data,unicode):
-            # str for Python3, unicode for Python2
-            data = data.encode(self.encoding,"replace")
-        try:
-            buffer = getattr(self.stream, 'buffer', self.stream)
-            # self.stream.buffer for Python3, self.stream for Python2
-            buffer.write(data)
-            buffer.flush()
-        except:
-            # We can do nothing if a write fails
-            raise
-    def __getattr__(self, attr):
-        return getattr(self.stream, attr)
-
-try:
-    from calibre.constants import iswindows, isosx
-except:
-    iswindows = sys.platform.startswith('win')
-    isosx = sys.platform.startswith('darwin')
-
-def unicode_argv():
-    if iswindows:
-        # Uses shell32.GetCommandLineArgvW to get sys.argv as a list of Unicode
-        # strings.
-
-        # Versions 2.x of Python don't support Unicode in sys.argv on
-        # Windows, with the underlying Windows API instead replacing multi-byte
-        # characters with '?'.  So use shell32.GetCommandLineArgvW to get sys.argv
-        # as a list of Unicode strings and encode them as utf-8
-
-        from ctypes import POINTER, byref, cdll, c_int, windll
-        from ctypes.wintypes import LPCWSTR, LPWSTR
-
-        GetCommandLineW = cdll.kernel32.GetCommandLineW
-        GetCommandLineW.argtypes = []
-        GetCommandLineW.restype = LPCWSTR
-
-        CommandLineToArgvW = windll.shell32.CommandLineToArgvW
-        CommandLineToArgvW.argtypes = [LPCWSTR, POINTER(c_int)]
-        CommandLineToArgvW.restype = POINTER(LPWSTR)
-
-        cmd = GetCommandLineW()
-        argc = c_int(0)
-        argv = CommandLineToArgvW(cmd, byref(argc))
-        if argc.value > 0:
-            # Remove Python executable and commands if present
-            start = argc.value - len(sys.argv)
-            return [argv[i] for i in
-                    range(start, argc.value)]
-        # if we don't have any arguments at all, just pass back script name
-        # this should never happen
-        return ["kindlekey.py"]
-    else:
-        argvencoding = sys.stdin.encoding or "utf-8"
-        return [arg if (isinstance(arg, str) or isinstance(arg,unicode)) else str(arg, argvencoding) for arg in sys.argv]
 
 class DrmException(Exception):
     pass
@@ -342,9 +277,7 @@ def usage(progname):
 
 
 def cli_main():
-    sys.stdout=SafeUnbuffered(sys.stdout)
-    sys.stderr=SafeUnbuffered(sys.stderr)
-    argv=unicode_argv()
+    argv=sys.argv
     progname = os.path.basename(argv[0])
     print("{0} v{1}\nCopyright © 2010-2020 Thom, Apprentice Harper et al.".format(progname,__version__))
 
diff --git a/DeDRM_plugin/argv_utils.py b/DeDRM_plugin/argv_utils.py
index 37bfb89..2ca4776 100644
--- a/DeDRM_plugin/argv_utils.py
+++ b/DeDRM_plugin/argv_utils.py
@@ -1,14 +1,17 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
-import sys, os
-import locale
-import codecs
-import importlib
+import sys
 
 # get sys.argv arguments and encode them into utf-8
-def unicode_argv():
-    if sys.platform.startswith('win'):
+def unicode_argv(default_name):
+
+    try:
+        from calibre.constants import iswindows
+    except:
+        iswindows = sys.platform.startswith('win')
+
+    if iswindows:
         # Uses shell32.GetCommandLineArgvW to get sys.argv as a list of Unicode
         # strings.
 
@@ -38,50 +41,8 @@ def unicode_argv():
                     range(start, argc.value)]
         # if we don't have any arguments at all, just pass back script name
         # this should never happen
-        return ["DeDRM.py"]
+        return [ default_name ]
     else:
         argvencoding = sys.stdin.encoding or "utf-8"
         return [arg if (isinstance(arg, str) or isinstance(arg,unicode)) else str(arg, argvencoding) for arg in sys.argv]
 
-
-def add_cp65001_codec():
-  try:
-    codecs.lookup('cp65001')
-  except LookupError:
-    codecs.register(
-        lambda name: name == 'cp65001' and codecs.lookup('utf-8') or None)
-  return
-
-
-def set_utf8_default_encoding():
-  if sys.getdefaultencoding() == 'utf-8':
-    return
-
-  # Regenerate setdefaultencoding.
-  importlib.reload(sys)
-  sys.setdefaultencoding('utf-8')
-
-  for attr in dir(locale):
-    if attr[0:3] != 'LC_':
-      continue
-    aref = getattr(locale, attr)
-    try:
-      locale.setlocale(aref, '')
-    except locale.Error:
-      continue
-    try:
-      lang = locale.getlocale(aref)[0]
-    except (TypeError, ValueError):
-      continue
-    if lang:
-      try:
-        locale.setlocale(aref, (lang, 'UTF-8'))
-      except locale.Error:
-        os.environ[attr] = lang + '.UTF-8'
-  try:
-    locale.setlocale(locale.LC_ALL, '')
-  except locale.Error:
-    pass
-  return
-
-
diff --git a/DeDRM_plugin/epubtest.py b/DeDRM_plugin/epubtest.py
index 79657a5..9213df8 100644
--- a/DeDRM_plugin/epubtest.py
+++ b/DeDRM_plugin/epubtest.py
@@ -53,75 +53,13 @@ import sys, struct, os, traceback
 import zlib
 import zipfile
 import xml.etree.ElementTree as etree
+from argv_utils import unicode_argv
 
 NSMAP = {'adept': 'http://ns.adobe.com/adept',
          'enc': 'http://www.w3.org/2001/04/xmlenc#'}
 
-# Wrap a stream so that output gets flushed immediately
-# and also make sure that any unicode strings get
-# encoded using "replace" before writing them.
-class SafeUnbuffered:
-    def __init__(self, stream):
-        self.stream = stream
-        self.encoding = stream.encoding
-        if self.encoding == None:
-            self.encoding = "utf-8"
-    def write(self, data):
-        if isinstance(data,str) or isinstance(data,unicode):
-            # str for Python3, unicode for Python2
-            data = data.encode(self.encoding,"replace")
-        try:
-            buffer = getattr(self.stream, 'buffer', self.stream)
-            # self.stream.buffer for Python3, self.stream for Python2
-            buffer.write(data)
-            buffer.flush()
-        except:
-            # We can do nothing if a write fails
-            raise
-    def __getattr__(self, attr):
-        return getattr(self.stream, attr)
+from utilities import SafeUnbuffered
 
-try:
-    from calibre.constants import iswindows, isosx
-except:
-    iswindows = sys.platform.startswith('win')
-    isosx = sys.platform.startswith('darwin')
-
-def unicode_argv():
-    if iswindows:
-        # Uses shell32.GetCommandLineArgvW to get sys.argv as a list of Unicode
-        # strings.
-
-        # Versions 2.x of Python don't support Unicode in sys.argv on
-        # Windows, with the underlying Windows API instead replacing multi-byte
-        # characters with '?'.  So use shell32.GetCommandLineArgvW to get sys.argv
-        # as a list of Unicode strings and encode them as utf-8
-
-        from ctypes import POINTER, byref, cdll, c_int, windll
-        from ctypes.wintypes import LPCWSTR, LPWSTR
-
-        GetCommandLineW = cdll.kernel32.GetCommandLineW
-        GetCommandLineW.argtypes = []
-        GetCommandLineW.restype = LPCWSTR
-
-        CommandLineToArgvW = windll.shell32.CommandLineToArgvW
-        CommandLineToArgvW.argtypes = [LPCWSTR, POINTER(c_int)]
-        CommandLineToArgvW.restype = POINTER(LPWSTR)
-
-        cmd = GetCommandLineW()
-        argc = c_int(0)
-        argv = CommandLineToArgvW(cmd, byref(argc))
-        if argc.value > 0:
-            # Remove Python executable and commands if present
-            start = argc.value - len(sys.argv)
-            return [argv[i] for i in
-                    range(start, argc.value)]
-        # if we don't have any arguments at all, just pass back script name
-        # this should never happen
-        return ["epubtest.py"]
-    else:
-        argvencoding = sys.stdin.encoding or "utf-8"
-        return [arg if (isinstance(arg, str) or isinstance(arg,unicode)) else str(arg, argvencoding) for arg in sys.argv]
 
 _FILENAME_LEN_OFFSET = 26
 _EXTRA_LEN_OFFSET = 28
@@ -219,7 +157,7 @@ def encryption(infile):
     return encryption
 
 def main():
-    argv=unicode_argv()
+    argv=unicode_argv("epubtest.py")
     if len(argv) < 2:
         print("Give an ePub file as a parameter.")
     else:
diff --git a/DeDRM_plugin/erdr2pml.py b/DeDRM_plugin/erdr2pml.py
index df25f86..1ec9993 100755
--- a/DeDRM_plugin/erdr2pml.py
+++ b/DeDRM_plugin/erdr2pml.py
@@ -84,41 +84,7 @@ from utilities import SafeUnbuffered
 iswindows = sys.platform.startswith('win')
 isosx = sys.platform.startswith('darwin')
 
-def unicode_argv():
-    if iswindows:
-        # Uses shell32.GetCommandLineArgvW to get sys.argv as a list of Unicode
-        # strings.
-
-        # Versions 2.x of Python don't support Unicode in sys.argv on
-        # Windows, with the underlying Windows API instead replacing multi-byte
-        # characters with '?'.
-
-
-        from ctypes import POINTER, byref, cdll, c_int, windll
-        from ctypes.wintypes import LPCWSTR, LPWSTR
-
-        GetCommandLineW = cdll.kernel32.GetCommandLineW
-        GetCommandLineW.argtypes = []
-        GetCommandLineW.restype = LPCWSTR
-
-        CommandLineToArgvW = windll.shell32.CommandLineToArgvW
-        CommandLineToArgvW.argtypes = [LPCWSTR, POINTER(c_int)]
-        CommandLineToArgvW.restype = POINTER(LPWSTR)
-
-        cmd = GetCommandLineW()
-        argc = c_int(0)
-        argv = CommandLineToArgvW(cmd, byref(argc))
-        if argc.value > 0:
-            # Remove Python executable and commands if present
-            start = argc.value - len(sys.argv)
-            return [argv[i] for i in
-                    range(start, argc.value)]
-        # if we don't have any arguments at all, just pass back script name
-        # this should never happen
-        return ["mobidedrm.py"]
-    else:
-        argvencoding = sys.stdin.encoding or "utf-8"
-        return [arg if (isinstance(arg, str) or isinstance(arg,unicode)) else str(arg, argvencoding) for arg in sys.argv]
+from argv_utils import unicode_argv
 
 import cgi
 import logging
@@ -485,7 +451,7 @@ def getuser_key(name,cc):
 def cli_main():
     print("eRdr2Pml v{0}. Copyright © 2009–2020 The Dark Reverser et al.".format(__version__))
 
-    argv=unicode_argv()
+    argv=unicode_argv("erdr2pml.py")
     try:
         opts, args = getopt.getopt(argv[1:], "hp", ["make-pmlz"])
     except getopt.GetoptError as err:
diff --git a/DeDRM_plugin/ignoblekeyGenPassHash.py b/DeDRM_plugin/ignoblekeyGenPassHash.py
index 7d3bec7..6f09bc4 100644
--- a/DeDRM_plugin/ignoblekeyGenPassHash.py
+++ b/DeDRM_plugin/ignoblekeyGenPassHash.py
@@ -52,42 +52,7 @@ except ImportError:
 
 from utilities import SafeUnbuffered
 
-def unicode_argv():
-    if iswindows:
-        # Uses shell32.GetCommandLineArgvW to get sys.argv as a list of Unicode
-        # strings.
-
-        # Versions 2.x of Python don't support Unicode in sys.argv on
-        # Windows, with the underlying Windows API instead replacing multi-byte
-        # characters with '?'.  So use shell32.GetCommandLineArgvW to get sys.argv
-        # as a list of Unicode strings and encode them as utf-8
-
-        from ctypes import POINTER, byref, cdll, c_int, windll
-        from ctypes.wintypes import LPCWSTR, LPWSTR
-
-        GetCommandLineW = cdll.kernel32.GetCommandLineW
-        GetCommandLineW.argtypes = []
-        GetCommandLineW.restype = LPCWSTR
-
-        CommandLineToArgvW = windll.shell32.CommandLineToArgvW
-        CommandLineToArgvW.argtypes = [LPCWSTR, POINTER(c_int)]
-        CommandLineToArgvW.restype = POINTER(LPWSTR)
-
-        cmd = GetCommandLineW()
-        argc = c_int(0)
-        argv = CommandLineToArgvW(cmd, byref(argc))
-        if argc.value > 0:
-            # Remove Python executable and commands if present
-            start = argc.value - len(sys.argv)
-            return [argv[i] for i in
-                    range(start, argc.value)]
-        # if we don't have any arguments at all, just pass back script name
-        # this should never happen
-        return ["ignoblekeygen.py"]
-    else:
-        argvencoding = sys.stdin.encoding or "utf-8"
-        return [arg if (isinstance(arg, str) or isinstance(arg,unicode)) else str(arg, argvencoding) for arg in sys.argv]
-
+from argv_utils import unicode_argv
 
 class IGNOBLEError(Exception):
     pass
@@ -120,7 +85,7 @@ def generate_key(name, ccn):
 def cli_main():
     sys.stdout=SafeUnbuffered(sys.stdout)
     sys.stderr=SafeUnbuffered(sys.stderr)
-    argv=unicode_argv()
+    argv=unicode_argv("ignoblekeyGenPassHash.py")
     progname = os.path.basename(argv[0])
     if len(argv) != 4:
         print("usage: {0} <Name> <CC#> <keyfileout.b64>".format(progname))
diff --git a/DeDRM_plugin/ignoblekeyNookStudy.py b/DeDRM_plugin/ignoblekeyNookStudy.py
index ba78934..6a5f1cf 100644
--- a/DeDRM_plugin/ignoblekeyNookStudy.py
+++ b/DeDRM_plugin/ignoblekeyNookStudy.py
@@ -34,41 +34,7 @@ try:
 except:
     iswindows = sys.platform.startswith('win')
 
-def unicode_argv():
-    if iswindows:
-        # Uses shell32.GetCommandLineArgvW to get sys.argv as a list of Unicode
-        # strings.
-
-        # Versions 2.x of Python don't support Unicode in sys.argv on
-        # Windows, with the underlying Windows API instead replacing multi-byte
-        # characters with '?'.  So use shell32.GetCommandLineArgvW to get sys.argv
-        # as a list of Unicode strings and encode them as utf-8
-
-        from ctypes import POINTER, byref, cdll, c_int, windll
-        from ctypes.wintypes import LPCWSTR, LPWSTR
-
-        GetCommandLineW = cdll.kernel32.GetCommandLineW
-        GetCommandLineW.argtypes = []
-        GetCommandLineW.restype = LPCWSTR
-
-        CommandLineToArgvW = windll.shell32.CommandLineToArgvW
-        CommandLineToArgvW.argtypes = [LPCWSTR, POINTER(c_int)]
-        CommandLineToArgvW.restype = POINTER(LPWSTR)
-
-        cmd = GetCommandLineW()
-        argc = c_int(0)
-        argv = CommandLineToArgvW(cmd, byref(argc))
-        if argc.value > 0:
-            # Remove Python executable and commands if present
-            start = argc.value - len(sys.argv)
-            return [argv[i] for i in
-                    range(start, argc.value)]
-        # if we don't have any arguments at all, just pass back script name
-        # this should never happen
-        return ["ignoblekey.py"]
-    else:
-        argvencoding = sys.stdin.encoding or "utf-8"
-        return [arg if (isinstance(arg, str) or isinstance(arg,unicode)) else str(arg, argvencoding) for arg in sys.argv]
+from argv_utils import unicode_argv
 
 class DrmException(Exception):
     pass
@@ -221,7 +187,7 @@ def usage(progname):
 def cli_main():
     sys.stdout=SafeUnbuffered(sys.stdout)
     sys.stderr=SafeUnbuffered(sys.stderr)
-    argv=unicode_argv()
+    argv=unicode_argv("ignoblekeyNookStudy.py")
     progname = os.path.basename(argv[0])
     print("{0} v{1}\nCopyright © 2015 Apprentice Alf".format(progname,__version__))
 
@@ -282,7 +248,7 @@ def gui_main():
             self.text.insert(tkinter.constants.END, text)
 
 
-    argv=unicode_argv()
+    argv=unicode_argv("ignoblekeyNookStudy.py")
     root = tkinter.Tk()
     root.withdraw()
     progpath, progname = os.path.split(argv[0])
diff --git a/DeDRM_plugin/ineptepub.py b/DeDRM_plugin/ineptepub.py
index c4f8dd1..8d112e4 100644
--- a/DeDRM_plugin/ineptepub.py
+++ b/DeDRM_plugin/ineptepub.py
@@ -72,39 +72,7 @@ def unpad(data, padding=16):
 
 from utilities import SafeUnbuffered
 
-def unicode_argv():
-    if iswindows:
-        # Uses shell32.GetCommandLineArgvW to get sys.argv as a list of Unicode
-        # strings.
-
-        # Versions 2.x of Python don't support Unicode in sys.argv on
-        # Windows, with the underlying Windows API instead replacing multi-byte
-        # characters with '?'.
-
-
-        from ctypes import POINTER, byref, cdll, c_int, windll
-        from ctypes.wintypes import LPCWSTR, LPWSTR
-
-        GetCommandLineW = cdll.kernel32.GetCommandLineW
-        GetCommandLineW.argtypes = []
-        GetCommandLineW.restype = LPCWSTR
-
-        CommandLineToArgvW = windll.shell32.CommandLineToArgvW
-        CommandLineToArgvW.argtypes = [LPCWSTR, POINTER(c_int)]
-        CommandLineToArgvW.restype = POINTER(LPWSTR)
-
-        cmd = GetCommandLineW()
-        argc = c_int(0)
-        argv = CommandLineToArgvW(cmd, byref(argc))
-        if argc.value > 0:
-            # Remove Python executable and commands if present
-            start = argc.value - len(sys.argv)
-            return [argv[i] for i in
-                    range(start, argc.value)]
-        return ["ineptepub.py"]
-    else:
-        argvencoding = sys.stdin.encoding or "utf-8"
-        return [arg if (isinstance(arg, str) or isinstance(arg,unicode)) else str(arg, argvencoding) for arg in sys.argv]
+from argv_utils import unicode_argv
 
 
 class ADEPTError(Exception):
@@ -359,7 +327,7 @@ def decryptBook(userkey, inpath, outpath):
 def cli_main():
     sys.stdout=SafeUnbuffered(sys.stdout)
     sys.stderr=SafeUnbuffered(sys.stderr)
-    argv=unicode_argv()
+    argv=unicode_argv("ineptepub.py")
     progname = os.path.basename(argv[0])
     if len(argv) != 4:
         print("usage: {0} <keyfile.der> <inbook.epub> <outbook.epub>".format(progname))
diff --git a/DeDRM_plugin/ineptpdf.py b/DeDRM_plugin/ineptpdf.py
index 64e21f8..b34b38c 100755
--- a/DeDRM_plugin/ineptpdf.py
+++ b/DeDRM_plugin/ineptpdf.py
@@ -98,40 +98,7 @@ from utilities import SafeUnbuffered
 iswindows = sys.platform.startswith('win')
 isosx = sys.platform.startswith('darwin')
 
-def unicode_argv():
-    if iswindows:
-        # Uses shell32.GetCommandLineArgvW to get sys.argv as a list of Unicode
-        # strings.
-
-        # Versions 2.x of Python don't support Unicode in sys.argv on
-        # Windows, with the underlying Windows API instead replacing multi-byte
-        # characters with '?'.
-
-
-        from ctypes import POINTER, byref, cdll, c_int, windll
-        from ctypes.wintypes import LPCWSTR, LPWSTR
-
-        GetCommandLineW = cdll.kernel32.GetCommandLineW
-        GetCommandLineW.argtypes = []
-        GetCommandLineW.restype = LPCWSTR
-
-        CommandLineToArgvW = windll.shell32.CommandLineToArgvW
-        CommandLineToArgvW.argtypes = [LPCWSTR, POINTER(c_int)]
-        CommandLineToArgvW.restype = POINTER(LPWSTR)
-
-        cmd = GetCommandLineW()
-        argc = c_int(0)
-        argv = CommandLineToArgvW(cmd, byref(argc))
-        if argc.value > 0:
-            # Remove Python executable and commands if present
-            start = argc.value - len(sys.argv)
-            return [argv[i] for i in
-                    range(start, argc.value)]
-        return ["ineptpdf.py"]
-    else:
-        argvencoding = sys.stdin.encoding or "utf-8"
-        return [arg if (isinstance(arg, str) or isinstance(arg,unicode)) else str(arg, argvencoding) for arg in sys.argv]
-
+from argv_utils import unicode_argv
 
 class ADEPTError(Exception):
     pass
@@ -2305,7 +2272,7 @@ def getPDFencryptionType(inpath):
 def cli_main():
     sys.stdout=SafeUnbuffered(sys.stdout)
     sys.stderr=SafeUnbuffered(sys.stderr)
-    argv=unicode_argv()
+    argv=unicode_argv("ineptpdf.py")
     progname = os.path.basename(argv[0])
     if len(argv) != 4:
         print("usage: {0} <keyfile.der> <inbook.pdf> <outbook.pdf>".format(progname))
diff --git a/DeDRM_plugin/k4mobidedrm.py b/DeDRM_plugin/k4mobidedrm.py
index bbd229e..c3200b6 100644
--- a/DeDRM_plugin/k4mobidedrm.py
+++ b/DeDRM_plugin/k4mobidedrm.py
@@ -90,41 +90,8 @@ import kfxdedrm
 
 from utilities import SafeUnbuffered
 
-def unicode_argv():
-    if iswindows:
-        # Uses shell32.GetCommandLineArgvW to get sys.argv as a list of Unicode
-        # strings.
+from argv_utils import unicode_argv
 
-        # Versions 2.x of Python don't support Unicode in sys.argv on
-        # Windows, with the underlying Windows API instead replacing multi-byte
-        # characters with '?'.
-
-
-        from ctypes import POINTER, byref, cdll, c_int, windll
-        from ctypes.wintypes import LPCWSTR, LPWSTR
-
-        GetCommandLineW = cdll.kernel32.GetCommandLineW
-        GetCommandLineW.argtypes = []
-        GetCommandLineW.restype = LPCWSTR
-
-        CommandLineToArgvW = windll.shell32.CommandLineToArgvW
-        CommandLineToArgvW.argtypes = [LPCWSTR, POINTER(c_int)]
-        CommandLineToArgvW.restype = POINTER(LPWSTR)
-
-        cmd = GetCommandLineW()
-        argc = c_int(0)
-        argv = CommandLineToArgvW(cmd, byref(argc))
-        if argc.value > 0:
-            # Remove Python executable and commands if present
-            start = argc.value - len(sys.argv)
-            return [argv[i] for i in
-                    range(start, argc.value)]
-        # if we don't have any arguments at all, just pass back script name
-        # this should never happen
-        return ["mobidedrm.py"]
-    else:
-        argvencoding = sys.stdin.encoding or "utf-8"
-        return [arg if (isinstance(arg, str) or isinstance(arg,unicode)) else str(arg, argvencoding) for arg in sys.argv]
 
 # cleanup unicode filenames
 # borrowed from calibre from calibre/src/calibre/__init__.py
@@ -286,7 +253,7 @@ def usage(progname):
 # Main
 #
 def cli_main():
-    argv=unicode_argv()
+    argv=unicode_argv("k4mobidedrm.py")
     progname = os.path.basename(argv[0])
     print("K4MobiDeDrm v{0}.\nCopyright © 2008-2020 Apprentice Harper et al.".format(__version__))
 
diff --git a/DeDRM_plugin/kindlekey.py b/DeDRM_plugin/kindlekey.py
index 304a891..60a6065 100644
--- a/DeDRM_plugin/kindlekey.py
+++ b/DeDRM_plugin/kindlekey.py
@@ -70,41 +70,7 @@ except:
     iswindows = sys.platform.startswith('win')
     isosx = sys.platform.startswith('darwin')
 
-def unicode_argv():
-    if iswindows:
-        # Uses shell32.GetCommandLineArgvW to get sys.argv as a list of Unicode
-        # strings.
-
-        # Versions 2.x of Python don't support Unicode in sys.argv on
-        # Windows, with the underlying Windows API instead replacing multi-byte
-        # characters with '?'.  So use shell32.GetCommandLineArgvW to get sys.argv
-        # as a list of Unicode strings and encode them as utf-8
-
-        from ctypes import POINTER, byref, cdll, c_int, windll
-        from ctypes.wintypes import LPCWSTR, LPWSTR
-
-        GetCommandLineW = cdll.kernel32.GetCommandLineW
-        GetCommandLineW.argtypes = []
-        GetCommandLineW.restype = LPCWSTR
-
-        CommandLineToArgvW = windll.shell32.CommandLineToArgvW
-        CommandLineToArgvW.argtypes = [LPCWSTR, POINTER(c_int)]
-        CommandLineToArgvW.restype = POINTER(LPWSTR)
-
-        cmd = GetCommandLineW()
-        argc = c_int(0)
-        argv = CommandLineToArgvW(cmd, byref(argc))
-        if argc.value > 0:
-            # Remove Python executable and commands if present
-            start = argc.value - len(sys.argv)
-            return [argv[i] for i in
-                    range(start, argc.value)]
-        # if we don't have any arguments at all, just pass back script name
-        # this should never happen
-        return ["kindlekey.py"]
-    else:
-        argvencoding = sys.stdin.encoding or "utf-8"
-        return [arg if (isinstance(arg, str) or isinstance(arg,unicode)) else str(arg, argvencoding) for arg in sys.argv]
+from argv_utils import unicode_argv
 
 class DrmException(Exception):
     pass
@@ -967,7 +933,7 @@ def usage(progname):
 def cli_main():
     sys.stdout=SafeUnbuffered(sys.stdout)
     sys.stderr=SafeUnbuffered(sys.stderr)
-    argv=unicode_argv()
+    argv=unicode_argv("kindlekey.py")
     progname = os.path.basename(argv[0])
     print("{0} v{1}\nCopyright © 2010-2020 by some_updates, Apprentice Harper et al.".format(progname,__version__))
 
@@ -1028,7 +994,7 @@ def gui_main():
             self.text.insert(tkinter.constants.END, text)
 
 
-    argv=unicode_argv()
+    argv=unicode_argv("kindlekey.py")
     root = tkinter.Tk()
     root.withdraw()
     progpath, progname = os.path.split(argv[0])
diff --git a/DeDRM_plugin/kindlepid.py b/DeDRM_plugin/kindlepid.py
index aea3509..24e0fe8 100644
--- a/DeDRM_plugin/kindlepid.py
+++ b/DeDRM_plugin/kindlepid.py
@@ -18,41 +18,7 @@ import binascii
 
 from utilities import SafeUnbuffered
 
-def unicode_argv():
-    if iswindows:
-        # Uses shell32.GetCommandLineArgvW to get sys.argv as a list of Unicode
-        # strings.
-
-        # Versions 2.x of Python don't support Unicode in sys.argv on
-        # Windows, with the underlying Windows API instead replacing multi-byte
-        # characters with '?'.
-
-
-        from ctypes import POINTER, byref, cdll, c_int, windll
-        from ctypes.wintypes import LPCWSTR, LPWSTR
-
-        GetCommandLineW = cdll.kernel32.GetCommandLineW
-        GetCommandLineW.argtypes = []
-        GetCommandLineW.restype = LPCWSTR
-
-        CommandLineToArgvW = windll.shell32.CommandLineToArgvW
-        CommandLineToArgvW.argtypes = [LPCWSTR, POINTER(c_int)]
-        CommandLineToArgvW.restype = POINTER(LPWSTR)
-
-        cmd = GetCommandLineW()
-        argc = c_int(0)
-        argv = CommandLineToArgvW(cmd, byref(argc))
-        if argc.value > 0:
-            # Remove Python executable and commands if present
-            start = argc.value - len(sys.argv)
-            return [argv[i] for i in
-                    range(start, argc.value)]
-        # if we don't have any arguments at all, just pass back script name
-        # this should never happen
-        return ["kindlepid.py"]
-    else:
-        argvencoding = sys.stdin.encoding or "utf-8"
-        return [arg if (isinstance(arg, str) or isinstance(arg,unicode)) else str(arg, argvencoding) for arg in sys.argv]
+from argv_utils import unicode_argv
 
 letters = 'ABCDEFGHIJKLMNPQRSTUVWXYZ123456789'
 
@@ -92,7 +58,7 @@ def pidFromSerial(s, l):
 
 def cli_main():
     print("Mobipocket PID calculator for Amazon Kindle. Copyright © 2007, 2009 Igor Skochinsky")
-    argv=unicode_argv()
+    argv=unicode_argv("kindlepid.py")
     if len(argv)==2:
         serial = argv[1]
     else:
diff --git a/DeDRM_plugin/mobidedrm.py b/DeDRM_plugin/mobidedrm.py
index 22cdb35..0374836 100755
--- a/DeDRM_plugin/mobidedrm.py
+++ b/DeDRM_plugin/mobidedrm.py
@@ -84,44 +84,7 @@ from alfcrypto import Pukall_Cipher
 
 from utilities import SafeUnbuffered
 
-iswindows = sys.platform.startswith('win')
-isosx = sys.platform.startswith('darwin')
-
-def unicode_argv():
-    if iswindows:
-        # Uses shell32.GetCommandLineArgvW to get sys.argv as a list of Unicode
-        # strings.
-
-        # Versions 2.x of Python don't support Unicode in sys.argv on
-        # Windows, with the underlying Windows API instead replacing multi-byte
-        # characters with '?'.
-
-
-        from ctypes import POINTER, byref, cdll, c_int, windll
-        from ctypes.wintypes import LPCWSTR, LPWSTR
-
-        GetCommandLineW = cdll.kernel32.GetCommandLineW
-        GetCommandLineW.argtypes = []
-        GetCommandLineW.restype = LPCWSTR
-
-        CommandLineToArgvW = windll.shell32.CommandLineToArgvW
-        CommandLineToArgvW.argtypes = [LPCWSTR, POINTER(c_int)]
-        CommandLineToArgvW.restype = POINTER(LPWSTR)
-
-        cmd = GetCommandLineW()
-        argc = c_int(0)
-        argv = CommandLineToArgvW(cmd, byref(argc))
-        if argc.value > 0:
-            # Remove Python executable and commands if present
-            start = argc.value - len(sys.argv)
-            return [argv[i] for i in
-                    range(start, argc.value)]
-        # if we don't have any arguments at all, just pass back script name
-        # this should never happen
-        return ["mobidedrm.py"]
-    else:
-        argvencoding = sys.stdin.encoding or "utf-8"
-        return [arg if (isinstance(arg, str) or isinstance(arg,unicode)) else str(arg, argvencoding) for arg in sys.argv]
+from argv_utils import unicode_argv
 
 
 class DrmException(Exception):
@@ -481,7 +444,7 @@ def getUnencryptedBook(infile,pidlist):
 
 
 def cli_main():
-    argv=unicode_argv()
+    argv=unicode_argv("mobidedrm.py")
     progname = os.path.basename(argv[0])
     if len(argv)<3 or len(argv)>4:
         print("MobiDeDrm v{0:s}.\nCopyright © 2008-2020 The Dark Reverser, Apprentice Harper et al.".format(__version__))
diff --git a/DeDRM_plugin/topazextract.py b/DeDRM_plugin/topazextract.py
index 3455cf3..1eaa2a5 100644
--- a/DeDRM_plugin/topazextract.py
+++ b/DeDRM_plugin/topazextract.py
@@ -27,41 +27,6 @@ from utilities import SafeUnbuffered
 
 from argv_utils import unicode_argv
 
-def unicode_argv():
-    if iswindows:
-        # Uses shell32.GetCommandLineArgvW to get sys.argv as a list of Unicode
-        # strings.
-
-        # Versions 2.x of Python don't support Unicode in sys.argv on
-        # Windows, with the underlying Windows API instead replacing multi-byte
-        # characters with '?'.
-
-
-        from ctypes import POINTER, byref, cdll, c_int, windll
-        from ctypes.wintypes import LPCWSTR, LPWSTR
-
-        GetCommandLineW = cdll.kernel32.GetCommandLineW
-        GetCommandLineW.argtypes = []
-        GetCommandLineW.restype = LPCWSTR
-
-        CommandLineToArgvW = windll.shell32.CommandLineToArgvW
-        CommandLineToArgvW.argtypes = [LPCWSTR, POINTER(c_int)]
-        CommandLineToArgvW.restype = POINTER(LPWSTR)
-
-        cmd = GetCommandLineW()
-        argc = c_int(0)
-        argv = CommandLineToArgvW(cmd, byref(argc))
-        if argc.value > 0:
-            # Remove Python executable and commands if present
-            start = argc.value - len(sys.argv)
-            return [argv[i] for i in
-                    range(start, argc.value)]
-        # if we don't have any arguments at all, just pass back script name
-        # this should never happen
-        return ["mobidedrm.py"]
-    else:
-        argvencoding = sys.stdin.encoding or "utf-8"
-        return [arg if (isinstance(arg, str) or isinstance(arg,unicode)) else str(arg, argvencoding) for arg in sys.argv]
 
 #global switch
 debug = False
@@ -434,7 +399,7 @@ def usage(progname):
 
 # Main
 def cli_main():
-    argv=unicode_argv()
+    argv=unicode_argv("topazextract.py")
     progname = os.path.basename(argv[0])
     print("TopazExtract v{0}.".format(__version__))