Figure out meaning of "Unknown3"

[RevZero]

Refers to the value that can be viewed on the Diagnostic tab in the column "Unknown3".

Bytes 12-15 in savegame file.

Value was always 0 for the savegames I tested.

[danarcher]

@RevZero I believe that's allegedly UncompressedSize, a hangover from XCOM 1 save headers, and I think it's always zero too, at least from my experiments.