This is an old problem that I have encountered when reading .chm files (Microsoft Compiled HTML Help File). For a long time I thought the file has broken during download or file transfer, but if I was putting the file in an archive (rar, zip) and opened it, it works. Outside the archive it gives this error:

This program cannot display the webpage

Most likely causes: You are not connected to the Internet. The website is encountering problems. There might be a typing error in the address.

What you can try:

Check your Internet connection. Try visiting another website to make sure you are connected.

Retype the address.

This problem can be caused by a variety of issues, including: Internet connectivity has been lost. The website is temporarily unavailable. The Domain Name Server (DNS) is not reachable. The Domain Name Server (DNS) does not have a listing for the website’s domain.

or it shows a blank page.

In this case, the first thing what you should do is to verify the path to the .chm file and its name. If a folder or the file contains the # symbol like in these examples

• folder name: F:\C# books
• file name: Learn C#.chm

then the solution is to rename the folder or the file and to remove the # symbol.

Searching the Internet, I have found that this problem may also be generated by a security issue

• http://support.microsoft.com/kb/902225/
• http://blogs.msdn.com/b/neerajag/archive/2006/04/26/584144.aspx