Sorry, but that seems to be a multi-game pack that was compiled by someone other than Sony.
If it was really done by Sony, I don't think that the main executable will not have a name like "SLPM_550.52".
And I see 3 other files with names like that - something that doesn't seem normal (I have never seen any Sony-licensed games like that!).
SCPH-10000 S. MINOKAMO v1.01 (Defunct)
SCPH-10000 S. KISARAZU v1.00 (faulty)
SCPH-15000 S. KOHDA (With warranty seal!) :D
DESR-5100 S. EMCS