.MQ4 File Extension
MQL4 Source Code File
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What is an MQ4 file?
An MQ4 file is a program written for MetaTrader, an online trading platform for Forex, Futures, and CFD markets. It contains code written in MetaQuotes Language 4 (MQL4), which typically includes variables, functions, and comments. MQ4 files may be custom indicators, scripts, or library files.
The MQ4 file is primarily used by MetaTrader 4 while the .MQ5 file replaced the MQ4 file with the release of MetaTrader 5.