Export the file to IDML
This is probably related to VDP software used by a printer, perhaps an HP Indigo, from waht I can find googling.
You say you need it to edit the file. Is that true? Most likely you don't and Salah's advice will strip it from the file and allow you to open without an error message. If you really need it to edit the file, though, you'll have to find out where it came from and install it.