| MetaTrader Program Format | |
| MetaQuotes | |
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EX4 files are used by online trading platform MetaTrader. MetaTrader allows users to trade Forex, Futures, and CFD markets.
EX4 files store MQL4 modules compiled using MetaTrader. MetaQuotes Language 4 (MQL 4) is a programming language used for writing transaction strategies. Programs written in this language are compiled and run on MetaTrader platform. Such programs for automating various trading and analytical processes in MetaTrader.
Windows
| .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 |