.CHM File Extension

Compiled HTML Help File

CHM files are compressed in a binary format with the .CHM extension. The format is for software documentation. Microsoft introduced it as the successor to WinHelp with Windows 95 OSR 2.5 and Windows 9...

General Information

Title CHM File Extension
Extension .chm
Full Form Compiled HTML Help File
File Type Help Documentation File
Developer Microsoft
MIME Type application/vnd.ms-htmlhelp

File Function

Primary Function Store help documentation
Additional Functions Interactive content, Navigation
Features Integrated search, Hyperlinks

File Characteristics

Quality High readability
Supports Layers N/A
Supports Transparency N/A
Editable With software

Use Cases

Software Documentation Yes
Product Guides Yes
FAQs Yes

Security and Practices

Security Risks Code execution, Malware
Best Practices Scan files, Trusted sources

Historical/Version Information

Initial Release 1997
Latest Version HTML Help 1.4

Associated Types

Similar Extensions .hlp, .doc, .pdf

Software Compatibility

Software Usage Policy OS Compatibility
Microsoft HTML Help Free Windows
XCHM Viewer Free Windows, Mac, Linux
Sumatra PDF Free Windows