appinfo.vdf V29 was introduced in Steam beta. This new version
introduces a space-saving optimization: instead of encoding each key
name in the binary VDF segment directly, an int64 identifier is instead
used for each key, with a table at the end of the 'appinfo.vdf' file
providing the mapping to actual key names.
Also see
SteamDatabase/SteamAppInfo@56b1fec7f5ce6be961c3e44cf9baf117e363ad91
FixesValvePython/steam#462
Co-authored-by: Eamonn Rea <[email protected]>
Eamonn Rea
Rossen Georgiev