CHM

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

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.

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.