CHM file

File extension	.chm
Category	eBook File
Description	The CHM file format was developed by Microsoft and first released along with Windows 98 and the format continues to be supported. This file format superseded WinHelp. CHM files grew in popularity due to the fact that they are fully compatible with a web browser which can be found on all computers. The vulnerability of this file type has been highlighted widely due to the ability for certain controls to be executed by the file.
Actions	CHM Converter View other ebook file formats
Technical Details	A .chm file comprises of a number of HTML pages and an Index. The format supports 28 different language types. The file provides functionality such as compression, merge and search. Just like a HTML page, the file can be composed of a variety of tags and images to enrich the content of the help files.
Associated programs	Beyond CHM Internet Explorer Microsoft Reader Mozilla Firefox
Developed by	Microsoft
MIME type	application/vnd.ms-htmlhelp
Useful links	More Information on CHM Technical Release Information on CHM EPUB to PDF CHM Converter

Using Zamzar it is possible to convert CHM files to a variety of other formats

This page contains information on the CHM file extension (Compiled HTML Help File), a popular ebook file format