What is CAT? CAT, short name for Catalog, is used as the file extension for Windows Catalog files. .CAT files are binary files that are used by Windows system to store information for a group of files. See the sample .CAT file included below.

File Extension: .CAT

MIME Type: application/octet-stream

File Content: Windows Catalog

.CAT files are Windows Catalog files saved as binary files. Here are the first 128 bytes of a sample .CAT file, btwaudio.cat, dumped in HEX values:

30 82 27 99 06 09 2a 86 48 86 f7 0d 01 07 02 a0 0.......H.......
82 27 8a 30 82 27 86 02 01 01 31 0b 30 09 06 05 ...0......1.0...
2b 0e 03 02 1a 05 00 30 82 0f 1b 06 09 2b 06 01 .......0........
04 01 82 37 0a 01 a0 82 0f 0c 30 82 0f 08 30 0c ...7......0...0.
06 0a 2b 06 01 04 01 82 37 0c 01 01 04 10 43 0e ........7.....C.
2e b9 d8 f3 d1 44 86 a4 d5 cf 0d 8e 7a 35 17 0d .....D......z5..
31 31 30 37 31 35 31 35 31 36 30 30 5a 30 0e 06 110715151600Z0..
0a 2b 06 01 04 01 82 37 0c 01 02 05 00 30 82 0d .......7.....0..

.CAT Windows Catalog file sample: Click sample.cat to download.