Hello,
Microsoft Compiled HTML Help is a Microsoft proprietary online help format, consisting of a collection of HTML pages, an index and other navigation tools. The files are compressed and deployed in a binary format with the extension .CHM, for Compiled HTML. As such web browser won;t be able to directly open and show the contents of this file. However you can try decompiling it and then show the individual HTML pages in the web browser. Alternatively you can check
this[
^] MSDN documentation to know more about how to accomplish it. it's for Windows Forms but should work with WPF.
Regards,