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Why do i get "The Address Is Not Valid" when viewing the CHM?

Open CHM and can view the index but every page you try to view gives the error ”The Address Is Not Valid”.
This is due the Windows “feature” of blocking certain file types, which are downloaded from the internet, from running on your machine. This occurs on Windows XP (with the latest hot fixes applied) and Windows Vista.
Ensure the chm is not currently open
Right click and view Properties.
Then click the “Unblock” button at bottom right of the dialog.

Note: If you would prefer not to trust this CHM then feel free to use the Sandcastle Help File Builder ( and the config file (Validation\SandCastleProject.shfb) to build your own chm.

Last edited May 11, 2010 at 6:09 AM by SimonCropp, version 7


SimonCropp May 11, 2010 at 6:09 AM 

rusgrafx May 10, 2010 at 11:39 PM 
The CMH in the title question should be replaced with CHM.