Doom 3 and Quake 4 Savegame File
SAVE is a savegame file format in Doom 3, Quake 4 and other games. Doom and Quake are both games of the popular and longstanding id software game development studio. A savegame file stores information about a player’s progress so that when the game is reloaded, the player can continue on from that point.
Learn more about .SAVE files:
Visit the id software webpage.
Wikipedia has more information about savegames.
Search for answers to .SAVE-related questions at ITKnowledge Exchange.com.