.CHM is a compiled HTML format used by Microsoft Help software. It also happens to work out as a very nice, indexed, searchable ebook format.

Here an excellent site on the CHM format ---> Unofficial HTML Help Specification

I'd personally find the module very useful. I've been wanting to use something like CHM to publish some things that I am writing, in a format more readable that PDF, but still somewhat portable. I was actually just about to start messing around with libchm myself...

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