Microsoft compiled HTML help module
File type: Dangerous and malicious file, Email attachment blocked file, Document file
Files with chm extension are mainly related to Microsoft compiled HTML help file format. CHM is acronym for Compiled Help Modules.
Found 5 different file type records with the same chm filename suffix.
File type category:
Dangerous and malicious file
Email attachment blocked file
Document file
Date updated: July 19, 2025
File extension chm is used for Microsoft compiled HTML help files. CHM is acronym for Compiled Help Modules. This format is used in Microsoft HTML Help, the standard help system for the Windows platform.
A .chm file represents a collection of HTML documents and other data such as images and JavaScript compressed into a single file.
These chm files contain a number of powerful features present in the specifications available here including: Table of Contents, Index of keywords and Full-text search functionality.
In the past ebooks were often saved in CHM format and some readers even existed, but it's not longer used for that purpose any formats like MOBI or EPUB are used instead
Various readers for CHM format exist, some are available direclty in Windows by default.
Some tools are able to export data from *.chm files.
Microsoft HTML Help Workshop (Microsoft Windows)
xCHM (Multiplatform)
Microsoft Windows Help (Microsoft Windows)
Firefox (Microsoft Windows)
Chmox (Apple macOS / Mac OS X)
Firefox for Mac (Apple macOS / Mac OS X)
Firefox for Linux (Linux/Unix)
Microsoft HTML Help Workshop (Microsoft Windows)
HelpScribble (Microsoft Windows)
chm2mobi (Linux/Unix)
HelpScribble (Microsoft Windows)
chmProcessor (Microsoft Windows)
Help Steward (Apple macOS / Mac OS X)
Chmox (Apple macOS / Mac OS X)
xCHM (Multiplatform)
Microsoft Windows (Microsoft Windows)
File type category:
Font and typeface file
Date updated: November 29, 2024
The chm file extension is associated with the Chameleon, a technology developed by Ares Software for font management.
Apple's operating system and printers will include Ares Software's Chameleon technology.
Used in Ares's FontChameleon program, Chameleon automatically generates TrueType and PostScript Type 1 fonts.
Use compatible tools to work with *.chm files.
Probably can be exported to other formats.
macOS (Apple macOS / Mac OS X)
Mac OS X (Apple macOS / Mac OS X)
File type category:
Various data file
Date updated: February 7, 2019
The chm file extension is associated with the ChemDraw, a chemical drawing solution for Microsoft Windows operating system.
The chm file stores chemical structure created in ChemDraw.
MIME types:
chemical/x-chemdraw
Use ChemDraw to open *.chm files.
Probably can be exported to other formats.
ChemDraw (Microsoft Windows)
HyperChem (Microsoft Windows)
ChemDraw (Microsoft Windows)
HyperChem (Microsoft Windows)
ChemDraw (Microsoft Windows)
HyperChem (Microsoft Windows)
ChemDraw (Microsoft Windows)
HyperChem (Microsoft Windows)
File type category:
Various data file
Date updated: June 18, 2019
The chm file extension is associated with the SWAT (Soil & Water Assessment Tool) a software for Microsoft Windows.
The chm file contains information about initial nutrient and pesticide levels of the soil in the HRU.
Probably not meant to be accessed by the user.
Probably cannot be converted to anything else.
SWAT (Microsoft Windows)
File type category:
Game file
Date updated: February 13, 2015
The chm file extension is associated with the Two Worlds 2 role playing (RPG) computer game.
The *.chm file contains model bone animation. Animation files are only for internal purposes of Two Worlds 2 game.
Two Worlds II (Microsoft Windows)
Language