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CHM is an archive format specially made for HTML based help by Microsoft. It
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is also known as HTMLHELP, but note that HTMLHELP2 (and in the future 3) are
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single file, there is also a TOC, an Index and fulltext search dictionaries
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The html in a CHM is basically unmodified except for links from one chm file
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to the other, these use a ms-its://file.chm/path/to/htmlfile.html like URL
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The format is sometimes related to security problems, but as far as I have
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been able to verify, this is more an Internet Explorer viewer application