Microsoft Compiled HTML Help
Microsoft Compiled HTML Help is a Microsoft proprietary online help format, consisting of a collection of HTML pages, an index and other navigation tools. The files are compressed and deployed in a binary format with the extension .CHM, for Compiled HTML. The format is often used for software documentation.
| Filename extension |
.chm |
|---|---|
| Internet media type |
application/vnd.ms-htmlhelp |
| Developed by | Microsoft |
| Initial release | 1997 |
| Latest release | 1.4 |
| Extended to | .lit |
| Developer(s) | Microsoft |
|---|---|
| Operating system | Microsoft Windows |
| Predecessor | Microsoft WinHelp |
| Successor | Microsoft Help 2 |
| Type | Help system |
It was introduced as the successor to Microsoft WinHelp with the release of Windows 95 OSR 2.5 and consequently, Windows 98. Within the Windows NT family, the CHM file support is introduced in Windows NT 4.0 and is still supported in Windows 11. Although the format was designed by Microsoft, it has been successfully reverse-engineered and is now supported in many document viewer applications.
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