Files that contain the .cnt file extension are used by Microsoft Windows to index the help files that are used by the Windows operating system. These files can be created by the Microsoft Help Workshop application, a program that is used to develop help documentation for the Windows OS.
The actual help files that are used by this program are saved with the .hlp file suffix. The table of contents files that organize the HLP files are saved with the .cnt file extension. CNT files are optional files and not all Windows HLP files with have a CNT file associated with it.
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