I seemed to fix it by putting a card into the card reader. Either python or mash must use C: for temporary file storage.
Traceback (most recent call last): File "mash.py", line 7, inimport masher File "C:\Program Files\Bethesda Softworks\Morrowind\Mopy\masher.py", line 43,in import wx.lib.iewin File "C:\Python25\Lib\site-packages\wx-2.8-msw-ansi\wx\lib\iewin.py", line 15, in import wx.lib.activex File "C:\Python25\Lib\site-packages\wx-2.8-msw-ansi\wx\lib\activex.py", line 36, in import comtypesImportError: No module named comtypes
Traceback (most recent call last): File "d:\morrowind\mopy\mash.py", line 7, in <module> import masher File "D:\Morrowind\Mopy\masher.py", line 460, in <module> 'off.green': Image(r'images/checkbox_green_off.png',wx.BITMAP_TYPE_PNG), File "D:\Morrowind\Mopy\balt.py", line 132, in __init__ raise ArgumentError(_("Missing resource file: %s.") % (self.file,))bolt.ArgumentError: Missing resource file: bolt.Path('images\\checkbox_green_off.png').