MQL vs MQ4?

[mozizyx]

I knoe what both means but asking which extension is which? For instance I got some EA and indicator with both EX4 or MQ4 extension and moat times since thwy all in a folder don't know which is an indicator or EA

[shawsoto]

One of the most important features of Meta Trader is the ability to write your own programs and attach them to Meta Trader terminal. Programs includes Indicators, Expert advisors, Scripts and Libraries. These programs written in a programming language called M Q L4 and can be used in Meta Trader by proper installing.