Install mfc42 in game's prefix

I installed the free version of Grand Theft Auto that Rockstar released on their website as a non-Steam game, and forced Proton 7.0-6 as a compatibility layer. Tested a bit, seemed like 7.0-6 worked best.

Instructions:

1. Install the game through normal Wine outside of Steam
2. Place the GTA folder somewhere you can reach it with Steam
3. Add the game to Steam as a non-Steam game (Grand Theft Auto.exe from WINO-subfolder, workdir the same WINO-folder)
4. Use protontricks -l to find the generated appid and correct prefix path
5. Use winetricks or protontricks to install mfc42 in the aforementionsed prefix
6. Run GTA Settings.exe with the same prefix
7. Add a winecfg library dll override of ddraw (native, builtin) in the same prefix
8. Unzip GTA1.WidescreenFix.zip from https://github.com/ThirteenAG/WidescreenFixesPack/releases/tag/gta1 to your GTA folder
9. Unrar https://gtamp.com/GTA1/GTAFixer.rar to your GTA folder and run GTAFixer.exe with the same wine prefix, answer yes to fix files
10. Game should now work through Steam