.MQ4 File

File extension mq4 seems to be mainly related to MetaTrader platform and used for one of its unique file type.

An .mq4 file represents a program written for MetaTrader 4, an online trading platform for Forex, Futures, and CFD markets; may be a Custom Indicator, Expert Advisor, Script, or Library file. It contains source code written in MQL4 (MetaQuotes Language 4), typically includes variables, classes, functions, and comments.

Files with mq4 suffix can be typically encountered as programs written in MetaQuotes programming language 4 for MetaTrader 4 trading platform.

How to open:

MetaEditor can be used to open and edit .mq4 files.

How to convert:

It seems that .mq4 files can be opened, edited and compiled into .ex4 files using MetaEditor, a specialized editor for creating trading robots and technical indicators.