Antichamber has no save "file" system, but it lets you have only one saved game at a time. The save is stored with the file name SavedGame.bin. You can delete your saved game and restart the game in the Antichamber, under the button titled appropriately.

Save game data locationEdit

System Location
Windows ..\Antichamber\Binaries\Win32\
Mac ~/Library/Application Support/Unreal Tournament 3/
Linux ~/.local/share/AlexanderBruce/Antichamber/