METAL GEAR SOLID 4 - Guns of the Patriots - Master Collection Version (2492670)

[Ultraguy24]

Compatibility Report

• Name of the game with compatibility issues: METAL GEAR SOLID 4 - Guns of the Patriots - Master Collection Version
• Steam AppID of the game: 2492670

System Information

• GPU: NVIDIA GeForce RTX 3060
• Video driver version: 610.57.04
• Kernel version: 7.1.11-arch1-1
• Link to full system information report as Gist:
• Proton version: Proton Experimental

I confirm:

• that I haven't found an existing compatibility report for this game.
• that I have checked whether there are updates for my system available.

steam-2492670.log

Symptoms

The game currently cannot detect save files from games from Metal Gear Solid Master Collection Vol.1 to unlock the in game golden camo. preorder camo is not affected.

Reproduction

1. ensure you have save data in Metal Gear Solid (2131630), Metal Gear Solid 2 (2131640) or Metal Gear Solid 3 (2131650).
2. Launch Metal Gear Solid 4 from Steam with any Proton version.
3. Navigate the launcher to launch the actual game.
4. At some point from going from the main menu, to either starting a new game or loading a previous one, you should get an in game pop up announcing that you have unlocked the golden camo. This does not happen under proton.

Steam Runtime Diagnostic.txt

[Ultraguy24]

For some extra information, the save data for each game is under it install directory, e.g. Steamapps/common/MGS2/mgs2_savedata_win/yoursteamID64/ MGS4 matches this pattern also.

[ItsLaguna]

I didn't experience this when I started playing MGS4, got both the preorder and gold camo pop-ups, was using Experimental too.
The only savedata I had from Vol1 was from MGS1.