Automated decompilers often produce "spaghetti code." You might get a file back, but it will have nonsense variable names (like g_var_122 ) and may not compile or trade correctly.

In the early days of MT4, decompiling was relatively easy. You could find various "EX4 to MQ4" converters online that functioned like simple extraction tools.

Converting a file you didn't write may violate the developer's Terms of Service or Copyright. The Best Alternative: Contact the Developer