GodVader

I have just tried to change it from Custom Mods tab and "Edit App IDs" yeah it is much faster and it works. I didn't get an error and the problem is solved. Thank you so much!

http://image.prntscr.com/image/86d74ef17e7e4091877d9ac6c3d18163.png

I will do it for Iron Maiden - Como Estais Amigos and Black Sabbath - NIB too don't worry  :D

the song that I wanna play is here.

http://customsforge.com/page/customsforge_rs_2014_cdlc.html/_/pc-enabled-rs-2014-cdlc/plagues-of-babylon-r22872

I try to configure the information of it for the appID and this error shows up

http://image.prntscr.com/image/48ff5be4d4394b24810f2799d899e59d.png

System.Argument.Exception: Invalid Characters on path.

After I tried to configure it, I can access the configure window, and change the appId. Then it looks like this in-game:

http://image.prntscr.com/image/41425f50b2234b3a9658bdc7eb36fd0b.png

If I press enter, it will disappear. 

Iron Maiden - Doctor Doctor and

Iced Earth - Burning Times

both same as well.