I have got a couple of MIDI sequences here which contain "M.SENBONGI" in the Track Title field, as well as some other text. I believe they are original compositions. I've had these since 1998 - there were probably around 50 others in the folder that I (stupidly) deleted, but for some reason I only kept these two. These aren't the original filenames either (original names were japanese, but showed as garbage text at the time.)
http://vgmusic.com/~lunar/temp/senbongi
Anyone know where they may be from? I got them from a friend, along with a bunch of other game midis and RPGMaker 95. The only thing I can think is that they are either original songs for a PC game, or they are extra stock songs intended for use with RPG Maker.
EDIT: here's the only other useful info in the midis.
ＷＩＮ－８～１３（タワー） BY M,SENBONGI ("Tower")
ＷＩＮ－８～２５（エンディング） BY M,SENBONGI ("Ending")