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CHM, CHM Compiled HTML Help File (.chm)


The .chm file format

CHM (Microsoft Compiled HTML Help) files belong to Microsoft’s proprietary files used for online help and are made up of HTML pages, an index and tools for navigation. The files are compressed and arranged in a binary format that uses the .CHM extension commonly associated with software documentation. CHM’s compatibility with web browsers, irrespective of the computer used, is the most favourable feature of this software.


.chm technical details

CHM files are the successor to Microsoft WinHelp, and support up to 28 different language types. CHM files carry with them the capability to carry out compression, merging, and searching within the document. In keeping with HTML page characteristics, the file can bear of a variety of tags and images to enhance the content of the help files. LZX compression is used in CHM files for archiving, while decompression is accomplished using the HTML Help Workshop and 7-Zip. With reverse engineering, CHM files are embraced by various document viewer programs and applications.


Additional information about CHM file format

File extension .CHM
File category EBOOK
Useful links
File conversion Convert a CHM file
Developer Microsoft Corporation
Associated programs Microsoft Internet Explorer, Microsoft Reader, Beyond CHM, Mozilla Firefox