Archive and compressed
Main article: List of archive formats
.?Q? files compressed by the SQ program.
7z 7-Zip compressed file
ALZ Alzip format
AT3 - Sony's UMD Data compression (90mb compressed to 900kb)
DDS - Texture file.
ARJ big Special file compression format used by Electronic Arts for compressing the data for many of EA's games
BKF (.bkf) Microsoft backup created by NTBACKUP.EXE