The File Extensions Database

.CHM File Extension

  • Developer by: Microsoft
  • Category: Web Files
  • Format: Binary

What is an .CHM file?

.CHM is Compiled HTML Help File

Help documentation compiled and saved in a compressed HTML format; may include text, images, and hyperlinks; viewable in a Web browser; used by Windows and other programs as an online help solution.

NOTE: Some CHM files may be opened using a Web browser, while others can only be opened with a CHM editor or CHM viewing program.

Programs that open Compiled HTML Help File
File Viewer Plus
GridinSoft CHM Decoder
GridinSoft CHM Editor
Softany WinCHM
Dawningsoft PowerCHM
Guohua ChmDecompiler
Help Explorer Viewer
Mozilla Firefox
Enolsoft CHM View
Apple Safari
Mozilla Firefox
Mozilla Firefox

How to solve problems with CHM files

  • Associate the CHM file extension with the correct application. On :
    Windows: Right click on any CHM file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.CHM files". Mac: Right click (or Ctrl-click) the CHM file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .CHM is Compiled HTML Help File. Because only the current version supports the latest CHM file format. Search, therefore, e.g. on the Microsoft manufacturer website after an available .CHM is Compiled HTML Help File update.
  • To make sure that your CHM file is not corrupted or virus-infected, get the file again and scan it with antivirus software.