Help with .ex4 file

 
I have an EA where I just have the ex4 file but not the mql4 source code file.  I would like to make some modificiation on the strategy but since I don't have the mql4 source code file, I can't do it.  Is there a way to work around this situation?  Kindly advise, thanks.
 

No, it is illegal. I would suggest contacting the author/devoleper.

Regards