| Term | Definition / Meaning / Stand for |
| AAC |
Advanced Audio Codec |
| ABW |
AbiWord Document |
| ACF |
Adobe Custom Filter |
| AEP |
Adobe After Effects Project |
| AI |
Adobe Illustrator |
| AIF |
Audio Interchange File |
| ANIM |
Animation File |
| ARC |
Archive File |
| AS3 |
ActionScript 3 Source File |
| AS |
ActionScript Source File |
| ASC |
ActionScript File |
| ASL |
Adobe Photoshop Style |
| AVI |
Audio Video Interleave |
| AXX |
AxCrypt Encrypted File |
| AZW |
Amazon Kindle eBook |
| BAK |
Backup File |
| BAS |
BASIC Source Code |
| BCP |
Bulk Copy Program |
| BDM |
Blu-ray Disc Movie |
| BDR |
Publisher Border File |
| BIN |
Binary File |
| BKF |
Windows Backup File |
| BLEND |
Blender Project File |
| BML |
Bean Markup Language |
| BMS |
Beatmania Song File |
| BOOT |
Boot Sector File |
| BPB |
Boot Parameter Block |
| BRD |
Eagle Circuit Board |
| BRF |
Braille Ready Format |
| BTX |
LaTeX Table File |
| BWT |
BlindWrite Disk Image |
| BZ2 |
Bzip2 Compressed File |
| BZ |
Bzip Compressed File |
| BZP |
Bzip2 Compressed Archive |
| CAB |
Windows Cabinet File |
| CAL |
Calendar File |
| CBR |
Comic Book Archive (RAR) |
| CBZ |
Comic Book Archive (ZIP) |
| CDA |
CD Audio Track |
| CDF |
Computable Document Format |
| CFG |
Configuration File |
| CGI |
Common Gateway Interface Script |
| CHM |
Compiled HTML Help |
| CLASS |
Java Class File |
| CMD |
Windows Command Script |
| CNF |
Configuration File |
| COD |
Compiled Source Code |
| CPL |
Windows Control Panel Item |
| CR2 |
Canon Raw Image File |
| CRDOWNLOAD |
Chrome Partially Downloaded File |
| CSV |
Comma-Separated Values |
| CT |
Cheat Engine Table |
| CVS |
CVS Version Control |
| DAT |
Data File |
| DBF |
Database File Format |
| DDS |
DirectDraw Surface |
| DEF |
Definition File |
| DES |
Design File |
| DIB |
Device-Independent Bitmap |
| DLL |
Dynamic Link Library |
| DMG |
Mac Disk Image |
| DNG |
Digital Negative Image |
| DRV |
Device Driver File |
| DTD |
Document Type Definition |
| EASM |
eDrawings Assembly File |
| EBS |
E-Book System File |
| ECM |
ECM Disc Image |
| ECW |
Enhanced Compressed Wavelet |
| EDB |
Exchange Database File |
| ELT |
Extract Load Transform File |