The File Extensions Database

.CAT File Extension

  • Developer by: Microsoft
  • Category: System Files
  • Format: Binary

What is an .CAT file?

.CAT is Windows Catalog File

File used by the Windows operating system; specifies that a group of files are from a verifiable source; used for security purposes and contains a digital signature, the catalog version, and an effective date; often used for verifying new software update files.

Windows catalog files help to suppress multiple trust dialog popups for new software component downloads. Since CAT files can identify a trusted source, the user can choose to "Always trust content" from the software distributor. Then, future downloads from the software distributor that use a CAT file are trusted and do not require a trust popup window.

Programs that open Windows Catalog File
Microsoft Windows
File Type 2 Advanced Disk Catalog Database
Developer by: Elcomsoft Category: Database Files

Contains a catalog of data from various media types including hard drives, network drives, floppy disks, optical discs (DVDs, CDs, etc.), ZIP and JAZ disks, etc.; used for keeping track of information stored within a collection of media

Programs that open Advanced Disk Catalog Database
Elcomsoft Advanced Disk Catalog

How to solve problems with CAT files

  • Associate the CAT file extension with the correct application. On :
    Windows: Right click on any CAT file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.CAT files". Mac: Right click (or Ctrl-click) the CAT file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .CAT is Windows Catalog File. Because only the current version supports the latest CAT file format. Search, therefore, e.g. on the Microsoft manufacturer website after an available .CAT is Windows Catalog File update.
  • To make sure that your CAT file is not corrupted or virus-infected, get the file again and scan it with antivirus software.