| ax | DirectShow Filter Plugin |
| azw2 | Amazon Kindle Active Content App |
| azw2 | Kindle Active Content App |
| b | BASIC Source |
| bas | Visual Basic Module |
| bas | BASIC Source |
| bat | MS-DOS Batch File |
| ba_ | Renamed BAT |
| 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 |
| cleo | CLEO Grand Theft Auto Mod |
| clix | CLIX Command |
| cls | Java Class |
| cmd | Command File |
| cnv | Microsoft Document Converter |
| cod | Microsoft C Compiler Output |
| codaplugin | Coda Plug-in |
| coff | Common Object File Format Image |
| colorpicker | Color Picker Plugin |
| com | Windows Command File |
| com | Executable File |
| command | Terminal Command |
| component | Mac OS X System Component |
