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