Opening downloaded HTML files does not work
If you cannot open HTML Help (CHM) files after downloading them, use one of the following methods:
- Double-click the .chm file.
- In the Open File-Security Warning dialog box, click to clear the Always ask before opening this file check box.
- Click Open.
- Right-click the .chm file, and then click Properties.
- Click Unblock.
- Double-click the .chm file to open the file.
For more information, refer to Microsoft Knowledge Base article 902225.