A Microsoft file format for distributing a collection of HTML files, along with their associated images, sounds, etc., as a single compressed archive file.

Microsoft use this format for Windows HTML Help files. Most chms include a project (.hhp) file listing the included files and basic settings, a contents (.hhc) file, an index (.hhk) file, html files, and, optionally, image files.

Users view chms with hh.exe, the HTML Help viewer installed with Internet Explorer.

Filename extension: .chm.

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