If you do not have the .mq4 file (the source code) you cannot make any modification on the program.
Aziz Ahmad:
You can not modify unless you have source file. You can still use your .ex4 file to attach on chart. As long as the owner has not locked it, it will work perfectly. You can check on your journal/expert tab to see whats happening…
Hello, I installed an indicator file, but it did not open, I imagine because it is in the EX4 extension, and I saw that the ones in the EA folder, the ones that open, are in the MQL4 SOURCE FILE extension,
SO I wanted to know how to change it, I'm waiting, thank you

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Hello, I installed an indicator file, but it did not open, I imagine because it is in the EX4 extension, and I saw that the ones in the EA folder, the ones that open, are in the MQL4 SOURCE FILE extension,
SO I wanted to know how to change it, I'm waiting, thank you