.chm file: how to open it on Windows

6 Windows apps register the .chm extension. Install one of them to open the file with a double-click.

About the format

Format

CHM document

Abbreviation

CHM · Compiled Help Modules

MIME type

application/vnd.ms-htmlhelp

PRONOM identifier

fmt/634

Format data: freedesktop.org shared-mime-info and PRONOM (The National Archives, UK).

• 
  calibre

  calibre is the one stop solution to all your e-book needs.

  Open source 9.17.0 1.5M ↓ ★ 26.2K
• 
  SumatraPDF

  SumatraPDF is a multi-format (PDF, EPUB, MOBI, CBZ, CBR, FB2, CHM, XPS, DjVu) reader for Windows.

  Open source 3.6.1 3M ↓ ★ 17.8K
• 
  7-Zip ZS

  File archiver with support for Brotli, Fast-LZMA2, Lizard, LZ4, LZ5 and Zstandard

  Open source 26.02-v1.5.7-R2 2.7M ↓ ★ 7.5K
• 
  7-Zip ZS Non Darkmode

  File archiver with support for Brotli, Fast-LZMA2, Lizard, LZ4, LZ5 and Zstandard

  Open source 26.02-v1.5.7-R2 ★ 7.5K
• O
  Okular

  The Universal Document Viewer

  Open source 26.08.1
• D
  Dr.Explain

  Help authoring tool to quickly create online manuals, help files, user guides and documentation.

  Proprietary 7.2.1394

Related guide: Change the default app for a file type in Windows