Error Accessing and Displaying CHM Files: Reasons and Solutions

So, you've got in trouble. Some or even all of your CHM files seem to have gotten corrupted. They show a "The page cannot be displayed" error in the left-hand pane of the CHM viewer. There are several possible reasons why your CHM e-books and documentation files are unreadable.

Crane, Dennis. Dr. Explain (2006). Articles>Documentation>Help>Microsoft Windows

Help.Longhorn - What is it?

The Help platform for Microsoft Windows is changing once again. Since 1995, Microsoft HTML Help has been the standard for Help systems for Windows applications, but the release of the next generation Windows operating system in 2005 will see a brand new XML-based Help platform. It is currently known as Help.Longhorn, or "Longhorn" Help, or sometimes as Help3 or TrésHelp.

Self, Tony. HyperWrite (2004). Articles>Documentation>Help>Microsoft Windows