However, there is a hard truth: (like converting a JPEG to PNG). EX4 is compiled, bytecode, designed to be read by MetaTrader 4, not by humans.
A: Use a hex editor to modify the EX4 directly. Search for the float value in the binary and change it. This is non-trivial but safer than decompiling.
What you are actually looking for is a —a tool that attempts to reverse-engineer the EX4 back into (imperfect) MQ4 source code.
Introduction: The Black Box Problem If you are a MetaTrader user, you have likely faced this frustrating scenario: You purchased an Expert Advisor (EA) or indicator, received a file ending in .ex4 , and now you want to modify the code—to change a take-profit level, remove a time filter, or fix a bug. But the source code ( .mq4 ) is missing.
A: No. Anyone claiming this is lying or distributing malware.