.m2 - World of Warcraft model object file
.lgt - Age of Mythology world lighting effect
.mdl - Flight Simulator 3D model file
.tdf - Total Annihilation features file
.sav - SpellForce 2 save game
.re4 - Resident Evil 4 file
.pak - Blitzkrieg archive file
.ffl - Aliens vs Predator game file
file extension PRD - Lode Runner game
File extension PRD description:
Lode Runner is a 1983 platform game, first published by Brøderbund. It is one of the first games to include a level editor, a feature that allows players to create their own levels for the game.
