Please look only at the last link that you have on lecture 13 for your EAs. There is not file with the name 300130601 GBPJPY M5, as you wrote.
Anyway for the rest you are right, this is how we name the magic numbers. This is because we test 100s of EAs and we need to have a good system to follow them.
If you are not generating new EAs with any of the softwares, you can simply name the Magic Numbers 1,2,3,4 and 5. No need to follow our system, since you have only 5 EAs.