.EX4 files are compiled executable programs written exclusively for the 'MetaTrader', stock trading platform. 'MetaTrader' is a platform created specifically for the online trading of assets using the Forex, Futures, and Contract for Difference (CFD) markets. .EX4 files will contain executable code that has been compiled from one or more .MQ4 files, and can thus also be decompiled back to .MQ4 files using PUREBEAM.BIZ EX4-TO-MQ4. .EX4 files can be executed exclusively on the MetaTrader platform,