CHM

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CHM files are compressed HTML files, which are basically the format for help files in Windows.

Troubleshoot

Navigation to webpage was canceled
  • The .chm file is on a network or remote drive. Try copy it on a local drive and open it from there
  • The .chm file was downloaded from the Internet, and blocked by Windows. In Windows Explorer, right click on the file → Properties..., then in the General pane → click on Unblock.

Viewing in Linux

(list from [1]):

gnochm
Viewer on Gnome — deprecated
kchmviewer
Viewer for KDE — ugly, no full support of tabs, etc
wine
Use windows help file viewer under wine:
wine hh.exe helpfile.chm
xChm
A .chm file viewer that is independent of the graphical environment
Firefox plugin - CHM Reader or chmFox
Ok, I admit it, this is the best viewer of all on Linux. Perfect rendering, fast.
It also include a sidebar to navigate through the CHM Contents and Index, and we can navigate back and forth using mouse gestures.
Actually even much better than the default reader, so even on Windows this is a better choice.
Okular
The pdf file viewer under kde, which can also show .chm files — not anymore ! Support has been removed


Otherwise a quick and dirty trick is to unpack the .chm file and to open up the index.html file.