CHM is Microsoft Compiled HTML Help file. The
file is a Microsoft proprietary online help format. It was introduced as the successor
to Microsoft WinHelp with the release of Windows 98 and is still supported in
Help is delivered as a binary file with the .chm extension. It contains a set
of HTML files, a hyperlinked table of contents, and an index file.
The file starts with bytes "ITSF" (in ASCII), for "Info-Tech
Storage Format". On Windows computers a .chm can be built with the freely-distributed
HTML Help Workshop.
To convert CHM to HTML or decompile CHM files, you could use
a free software - 7-Zip. The 7-Zip is a open source freeware.
The freeware could be used for personal or commercial purpose.
7-Zip works in Windows 10 / 8 / 7 / Vista / XP / 2008 / 2003 / 2000 / NT / ME /
The free CHM decompiler could decompile any files in CHM file. And, it's very
simple and easy to convert CHM to HTML files. Just right-click on CHM file and
choose "7-Zip" -> "Open archive".
And then click "Extract" on 7-Zip, choose an output foler,
then click OK.
Once extract completes, you get the outputted HTML and image files.