This is more of a note to myself / a try to give the problem a bit more SEO visibility, so please excuse the probably weird writing style and structure.
tl;dr at the bottom
- .PL extension is for "PrinterLeaf" files
- They start with the magic bytes
D0 4F 50 53(ÐOPS) - Commonly contain header strings like:
For:/Printed on:/From book:/Document:/Last saved on:
Name:/Ausgedruckt:/Aus dem Buch:/Dokument:/Zuletzt gespeichert:
- They start with the magic bytes
- And for my test file they contained references to font files like: