.CAT File Extension
File Type 1Windows Catalog File
This file is saved in a binary format, which requires a specific program to read its contents.
What is a CAT 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.
File Type 2Advanced Disk Catalog Database
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
.CAT File Association 2
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