file is the actual license file extracted from a real Vita. A zRIF is simply a text-string representation
Many NoNpDrm dumping tools will display the directly on screen or save it to a .rif or .zrif text file. If you have a NoNpDrm dump, look for a zrif.txt or use a PC tool like Rif to Zrif converter (available on GitHub). Zrif Key Vita3k