Problem: You open a CHM but you don’t see your content in the right-hand pane of the window. CHM file shows blank pages and do not show content.
Solution: Right-click the CHM file, select Properties, then click the “Unblock” button
1. Right-click the CHM file, and then click Properties.
2. Click Unblock.
3. Double-click the .chm file to open the file.