Hello.
I noticed that in some versions of the game, no matter where the game itself is installed and run from, the save file will always go to "C:\Program Files\Infestation\".
If you do a hex dump of the `Infest.exe` binary you'll see "C:\Program Files\Infestation\" hardcoded at 0x126c20.
Also, the save file itself is a single file called "Infest.sav".