CAT File Type- The quick facts
What are CAT files and how to open them
Are you having problems opening a CAT 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 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.
How to open CAT files
Important: Different programs may use files with the CAT file extension for different purposes, so unless you are sure which format your CAT file is, you may need to try a few different programs.
While we have not verified the apps ourselves yet, our users have suggested 10 different CAT openers which you will find listed below.
Last updated: July 13, 2020
Suggest another file format using extension CAT
While we know of one file format using the .CAT 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 .CAT file.
Various apps that use files with this extension
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.