REL file extension - PDP-10 relocatable object file
What is rel file? How to open rel files?
File type specification:
The REL file extension is associated with the PDP-10.
The PDP-10 was a mainframe computer manufactured by Digital Equipment Corporation (DEC) from the late 1960s on; the name stands for "Programmed Data Processor model 10".
The .rel file stores relocatable object.
The PDP-10 uses operating system called Monitor later renamed on TOPS-10.