Yeah. I don't really understand why Gimp doesn't just give you some info box with "you are missing the font xy used in this image file", when it encounters such text layers in a file you want to work with, but are missing a font. That would certainly be more convenient than me having to mess around with font identification websites. *sporks the technology some*

On the bright side, I think I have found the font I was using in the font folder of my backup drive.