Call of Duty: Modern Warfare 3 Save Game Location

Windows

Call of Duty: Modern Warfare 3 save games can be found on Windows here:

C:\Program Files\Activision\Modern Warfare 3\players2\save

Steam:

Call of Duty: Modern Warfare 3 save games installed through Steam can be found on Windows here:

C:\Program Files (x86)\Steam\steamapps\common\call of duty modern warfare 3\players2\save

Linux

Call of Duty: Modern Warfare 3 save games can be found on Linux (Proton) here:

~/.steam/steam/userdata/[user_id]/115300