CAT File

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?

CAT files have multiple uses, and Microsoft Security Catalog is one of them. Read more about the others further down the page.

Microsoft Security Catalog File

A security catalog file is a digital signature for a collection of files. A catalog file contains a collection of cryptographic hashes - one for each file in the collection.

Plug and Play device installation recognizes the signed catalog file of a device driver package as its digital signature, where each "thumbprint" in the catalog file corresponds to a file that is installed by the driver package.

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: June 29, 2022

More file formats using the CAT extension

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

  • Casio Calculator Tape Format
  • Elcomsoft Advanced Disc Catalog File
  • Frostbite Catalog File
  • HotHelp Catalog File
  • Maxon Cinema 4D Catalog
  • Starcat Disks Catalog File
  • WinCat Disk Catalog 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.

X3 EditorX3 EditorUser submitted
Petz Your virtual PetzPetz Your virtual PetzUser submitted
Visual dBASEVisual dBASEUser submitted
ImpromptuImpromptuUser submitted
BrillKids Little ReaderBrillKids Little ReaderUser submitted
Little ReaderLittle ReaderUser submitted
netViz ProfessionalnetViz ProfessionalUser submitted
CubeCubeUser submitted
CatzCatzUser submitted
Petz II, Your Virtual PetzPetz II, Your Virtual PetzUser 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 CAT file formats, example files, or compatible programs. Please use the links below or email us at to discuss further.