PAF (Personal Ancestral File)
Personal Ancestral File (PAF) was free genealogy software provided by FamilySearch, a website operated by The Church of Jesus Christ of Latter-day Saints.
PAF software up to v2 used individual .DAT file to store genealogical data. File names included, INDIV2.dat, MARR2.dat, NAME2.dat, NOTES2.dat, REPTITL2.dat, etc.
PAF software versions 3-5 used a single .PAF file to store data. Version 5 header starts with ascii
500 500 PAF