It looks like (according to Google) .chn files are the product of a program called maestro (pages were full of jargon I didn't understand, but I get the impression it's something to do with chrystals). I couldn't find anything for Linux that would read that.
Did you happen to mean SHN files? Those are audio, and a lot of programs under Linux can play 'em (try xmms or realplay).
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