BizHawk is a multi-system emulator written in C#. BizHawk provides nice features for casual gamers such as full screen, and joypad support in addition to full rerecording and debugging tools for all system cores.
-Finished ImportVMV:
--I'm not sure what the following comment means: "For the other control bytes, if a key from 1P to 4P (whichever one) is entirely ON, the following 4 bytes becomes the controller data." I'm going to assume this is a bad translation that is the equivalent of my 4 controllers = 4 bytes comment.
--Nesmock has a block of code that seems to handle, or at least account for, commands (Lines 207 - 239 of virtuanes.hh). I don't do anything about this, but it doesn't seem like Nesmock does much of anything about it either. I'll ignore this for now.
TODO: ImportNMV, clean up ImportMCM, and perhaps support other platforms for .MCM, although everyone thinks it's a waste...I like writing importers! I'm afraid of writing cores!