| Program Source Format | |
| N/A | |
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Files with the .PRG extension contain a program, function, or source code of the program. PRG files are used by various applications and are not clearly defined.
PRG files can be in the form of an executable function or a script, which can be run in another program, as well as the source code of the whole program in text form, which, after compilation, creates a separate executable program.
| .a6p | Adobe Authorware Application Format |
| .action | Mac OS X Automator Action Format |
| .actm | Autodesk AutoCAD Action Macro Format |
| .ahk | AutoHotkey Script Format |
| .air | Adobe AIR Rich Internet Applications |
| .apk | Google Android Package Format |
| .app | MAC Application Package Or Core System Service Format |
| .applescript | AppleScript Script Format |
