CNT File - opening and understanding

Did your computer fail to open a CNT file? We explain what they are used for and recommend software that we know can open or otherwise handle your .CNT files.

What is a CNT file?

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.

How to open CNT files

You will need a program compatible with the specific file you are trying to open, as different programs may use files with file extension CNT for different purposes.

While we have not verified the apps ourselves yet, our users have suggested 8 different CNT openers which you will find listed below.

Suggest another file format using extension CNT

While we know of one file format using the .CNT file extension, there may be more. It is widespread that different programs use files with the same file extension for very different types of data. Please let us know if you are aware of a different kind of .CNT file.

Various viewers for this file format

These apps are known to open certain types of CNT files. Remember, different programs may use CNT files for different purposes, so you may need to try out a few of them to be able to open your specific file.

PDLPDLUser submitted
Help WorkshopHelp WorkshopUser submitted
Microsoft OfficeMicrosoft OfficeUser submitted
ProVenture InvoicesProVenture InvoicesUser submitted
Any Video Converter FreeAny Video Converter FreeUser submitted
Emb ApplicationEmb ApplicationUser submitted
Celframe Office Note MakerCelframe Office Note MakerUser submitted
PicasaPicasaUser submitted
We have not verified any software that we know for certain will work with CNT-files on Mac. If you know one, please use the 'Suggest a program' link below and tell us about it!
We have not verified any web services that we know for certain will work with CNT-files. If you know one, please use the 'Suggest a program' link below and tell us about it!