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One good starting option is to use the [FITS|http://code.google.com/p/fits/] tool, which combines a number of tools in order to identify and describe files.
The [AQuA:AQuA Mashup Tool List] may hold some other good tools - see also the [TR:Toolsold] page.
See [TR:] for more lists of tools.
Oh, and having looked up the '.ch' extension, I think it's likely that the extension is simply wrong, but of course it could always be _really_ some obscure format. Identification tools should be able to determine this quickly enough.