Steam saves use a simple data####.bin naming scheme. Remove the long identifier, rename to data0001.bin , and place in My Games\Persona 4 Golden\ .
%USERPROFILE%\Documents\My Games\Persona 4 Golden\ Persona 4 Golden -010062B01525C800--v131072--US...
Persona 4 Golden -010062B01525C800--v131072--US is far from random noise. It’s a that tells you: Steam saves use a simple data####
In P4G’s internal save structure: