Microsoft HTML Help is the standard help system for the Windows platform.
|.chw - Compiled Help Index File (Misc Files)
When a chm help file is merged with others a index file is created, this contains a table of contents of the various chm files. [More Information]
|.hlp - Microsoft Help File (System Files)
Files that have the .hlp file extension are Windows Help Files, these are files used by windows which contain information for the user to learn about... [More Information]