MSXCast currently is in a WIP status so there is a chance that it doesn't play all existing MSX/2 games.
http://www.dreamcast-scene.com/index.php/Main/MSXCast
It's also possible that the image you've downloaded doesn't contain the proper BIOS files for certain MSX variants. Please avoid to mention your downloaded Warez here at DCEmu UK in the future.
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