Game completed 100% on "Nightmare" difficulty, everything collected

Save from the Steam version of the game. I completed it personally in February 2025. I couldn't figure out how exactly saves work in this game, because I tried to find a save myself, but none of them were read by the game.

Path to install the save: "C:\Users\User\Saved Games\id Software\DOOM\base"

My steam_id (just in case): 76561198124141003

steamID: STEAM_0:1:81937637 
steamID3: [U:1:163875275] 
steamID64: 76561198124141003 
customURL: alicelel_

Author: Alicelel