Files with bpd suffix can be found as binary version PostScript printer description file format.
BPD file extension - PostScript binary printer description
What is bpd file? How to open bpd files?
File type specification:
File extension bpd is in most cases used for a binary versions of text-based PostScript printer description files (.ppd files) which describe a PostScript printer's characteristics.
Pscript reads a printer's .ppd file and converts the text into a binary format, stored locally as a .bpd file that is regenerated every time the .ppd file changes.