Alright, I've looked through it and yes, I've found a lot of these bugs that people have mentioned.
The window minimization problems and the code generation that doesn't work if the file doesn't exist to start with I've tracked down.
(The odd thing is, people aren't seeing error messages. These bugs should trigger the error handlers. They do when I'm developing).
As for the other errors involving the extraction, or the OP2_ART error: These could be caused by an invalid OP2Editor.dll file. To try and fix the problem, first uninstall any copies of OP2Mapper 2. Then, go into the Mapper directory, and delete the Mapper2.ini file you see there.
Go to your system folder (C:\Windows\System32 on NT/2k/XP, C:\Windows\System on 9x/Me) and delete any OP2Editor.dll file you see there.
Reinstall the mapper and try again.
Another thing that could cause that OP2_ART error is an invalid OP2 install. Reinstall OP2 fully and point the mapper to the dir with the correct OP2 install in it. It needs a working maps.vol file to load all the unit graphics.
Again, thanks for the bug reports!