CNT File

What are CNT files and how to open them

Are you having problems opening a CNT file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is a CNT file?

CNT files have multiple uses, and Windows Help File Contents is one of them. Read more about the other uses further down the page.

Windows Help File Contents

Microsoft Windows uses files containing the .cnt file extension to index the help files used by the Windows operating system. These files can be created by the Microsoft Help Workshop application, a program used to develop help documentation for the Windows OS.

The actual help files 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 have a CNT file associated with them.

How to open CNT files

We have identified one CNT opener that is compatible with this specific type of CNT file.

Programs that open Windows Help File Contents files

Help WorkshopHelp WorkshopVerified

Last updated: December 5, 2022

More file formats using the CNT extension

Through our research of CNT files, we know that the following formats exist. However, we have not yet analyzed them in detail.

  • Painter 3D Contour Image File

Various apps that use files with this extension

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
Microsoft OfficeMicrosoft OfficeUser submitted
ProVenture InvoicesProVenture InvoicesUser submitted
Emb ApplicationEmb ApplicationUser submitted
Celframe Office Note MakerCelframe Office Note MakerUser submitted
PicasaPicasaUser submitted

Help us help others helps thousands of users every day, and we would love to hear from you if you have additional information about CNT file formats, example files, or compatible programs. Please use the links below or email us at to discuss further.