| 386 | Windows 3.x Virtual Device Driver |
| 3dsx | Nintendo 3DS Homebrew Launcher |
| 73k | TI-73 Application |
| 83p | TI-83 Calculator Program |
| 85p | TI-85 Calculator Program |
| 89p | TI-89 Calculator Program |
| 8xp | TI-83/84 Plus Calculator Program |
| a4r | Macromedia Authorware Packaged File without Runtime |
| a5r | Macromedia Authorware Packaged File without Runtime |
| a6r | Macromedia Authorware Packaged File without Runtime |
| a7r | Macromedia Authorware Packaged File without Runtime |
| acm | Microsoft Audio Compression Manager Codec |
| action | Automator Action |
| acx | Atari ST Executable |
| aos | Nokia Phone Add-on Software |
| app | SymbianOS Compiled Application |
| arx | Autodesk AutoCAD Runtime Extension |
| ary | SmartStart Array Configuration Script |
| ax | DirectShow Filter Plugin |
| azw2 | Amazon Kindle Active Content App |
| b | BASIC Source |
| bas | BASIC Source |
| bas | Visual Basic Module |
| bat | MS-DOS Batch File |
| bblm | BBEdit Language Module |
| blu | FileMaker Pro Runtime Extension |
| btapp | uTorrent Application |
| btm | 4DOS Batch File |
| bundle | Mac OS X Application Plug-in |
| caction | Automator Converter Action |
| cgi | Common Gateway Interface |
| cla | Java Class |
| class | Java Class |
| clix | CLIX Command |
| cls | Java Class |