File Type Generic IconHelp Contents File
File Format Proprietary (Microsoft)
Usage Open manually
Rank ★ ★ ☆  Average

Help file used by Windows; contains topics relevant to a certain Help document; may be created Microsoft Help Workshop, a program for developing help documentation; may be updated to the newer HTML Help Workshop format (.HHC file) using HTML Help Workshop.

Important: There is a known security issue with CNT files that allows them to be exploited, causing a stack-based buffer overflow. This can be used to run malicious code. Therefore, do not open unknown CNT files.

Open With

IconMicrosoft HTML Help Workshop

Updated 2007
Information from the PC File Extensions Reference