Need help with an EA built for mt5

Dear Coders, 

I have an mt5 EA. It has the ability to call txt file using FileOpen to use the txt files as .set for the EA. I can store i.e. 10 txt files with unique setting and EA will use them randomly or in order. 

This is already coded and it used to work just fine. I am reusing this EA after a year now and I have forgotten how to use it, what was the naming convention and where to store my txt files. 

I need your help to look at the code, and teach how to use it. 

Thanks.