How to open CAT files

Did your computer fail to open a CAT file? We explain what CAT files are and recommend software that we know can open or convert your files.

What is a CAT file?

The .cat file extension can be found in files that are commonly used in a variety of Microsoft and Internet applications. A CAT file is necessary because it holds the security catalog file that contains a list and digest files. A digest is a number generated by an algorithm and is uniquely identifiable to a given file, like a fingerprint. The digest is used for security or validation purposes.

Catalog files are used in order to avoid multiple trust dialog boxes when users download software components from the Internet. Trust dialog boxes are modal security warnings that prompt users before a software is installed on their computers. Catalog files specify that a given set of files belongs to the same logical group of files.

They identify which program files are already installed on the system and if the user attempts to download another program with the same program files, CAT files prompt the user that the same files are already installed to avoid duplication. CAT files also help the user to use trusted programs by putting a focus utilization to applications that are already tried and tested.

CAT file openers, viewers, etc.

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

X3 EditorX3 EditorUser submitted
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Petz II, Your Virtual PetzPetz II, Your Virtual PetzUser submitted
We have not verified any programs that we know for certain can work with CAT-files on Mac. If you know one, please use the Suggest link below and tell us about it!
We have not verified any online services that we know for certain can work with CAT-files. If you know one, please use the Suggest link below and tell us about it!