You downloaded a free "Heiken Ashi Smoothed" indicator in EX4 format. You want to see its smoothing logic and modify the period.

So, how do you get from .ex4 to .mq4 —and can you do it ?

If you are decompiling a $30 EA for personal learning, a free tool is fine. If you are trying to recover a lost proprietary strategy worth thousands, pay for a professional service or rewrite from scratch. Part 10: The Absolute Best "Free" Method – Ask for the Source Code Before you risk malware and legal trouble, consider this: Contact the original developer.