Unable to Open a CHM file – You get a Unable to display web page error

When you try to open CHM files you might encounter issues. This is primarily due to 2 reasons.


  1. Security
  2. File path contains certain characters like #, ?, &, +


To overcome the security issue you have to follow the steps below..

  1. When you open the file you will be prompted with a security warning which you can dismiss by un checking the “Always ask…” checkbox and clicking “Open” button.
  2. Right Click the file and select properties from context menu. Click unblock button at the bottom and click Apply, OK




If you still get the error “This program cannot display the webpage” then verify if the path to the file has any invalid characters. For example a  path “C:\My C# Project Documentation\MyHelpFile.chm” will not work !


Change your path to “C:\My CSharp Project Documentation\MyHelpFile.chm” and it will work.


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