PrBoom + has a launcher? Never appeared to me, always had to use a .bat file.
I did manage to make it work via .bat file, turns out I had made a mistake writing it, a missed space between the .wad file and the complevel.
I appreciate the help!
EDIT: I do have a question, in a bat file, if I want to add more than one wad, do I have to just write -file and then every wad I want to add, or to I need to write -file before each individual wad?