Identify file length field

[wpafbo79]

As a modder, I want to know the file length field so that when I modify the save game file, I can update the length field to match the new file size, allowing the new file to be recognized by the game.

[wpafbo79]

The file length field has an offset of 0x14 (20 decimal) bytes and is 3 bytes long in little-endian format.