CHM

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File Format
Name CHM
Ontology
Extension(s) .chm
MIME Type(s) application/vnd.ms-htmlhelp
PRONOM fmt/634
Released 1997

CHM (Compiled HTML Help), AKA Microsoft Help 1, is a Microsoft format for help files. While it is proprietary, it has been reverse engineered, and many software applications can read it.

It is a compressed binary file format, including content in HTML as well as other related data.

Microsoft Help 2 was intended as a successor, but never saw much use.

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