Try to open a game from Mamewah then post the last entry in your mamewah.log file. It should look something like this
5/31/2005 10:45:54 PM MAMEWAH launched
5/31/2005 10:45:54 PM Cursor scheme: Windows default, Arrow: (None), Wait: (None), AppStarting: (None)
5/31/2005 10:45:54 PM Desktop colour: 0
5/31/2005 10:45:54 PM Wallpaper filename:
5/31/2005 10:45:54 PM Display mode: 1280x1024 @ 60Hz, 32 bit colour
5/31/2005 10:45:54 PM Decimal symbol: '.'
5/31/2005 10:45:54 PM Games list read: 0002-1.lst
5/31/2005 10:45:55 PM Layout selected: G:\Emulation\Mamewah\layouts\_installed layouts\0002.lay
5/31/2005 10:45:55 PM Ctrlr file selected: G:\Emulation\Mamewah\ctrlr\default.ini
5/31/2005 10:46:02 PM Layout selected: G:\Emulation\Mamewah\layouts\_installed layouts\0001.lay
5/31/2005 10:46:02 PM Games list read: 0001-1.lst
5/31/2005 10:46:28 PM Commandline run: G:\EMULAT~1\PROJEC~1\PROJEC~2.EXE "d:\roms\n64\BANJO-KAZOOIE (U) [!].zip" {flags=9}
5/31/2005 10:47:45 PM Commandline run: G:\EMULAT~1\PROJEC~1\PROJEC~2.EXE "d:\roms\n64\EXTREME-G XG2 (U) [!].zip" {flags=9}
5/31/2005 10:48:52 PM MAMEWAH quit