Sources:

• https://gist.github.com/raphaelbruno/609a61bbad8ef011ff9c9c82ef200e17
• ValveSoftware/Proton#148 (comment)

Assetto Corsa

0. Install the game or run rm -rf ~/.steam/root/steamapps/compatdata/244210/pfx ~/.steam/root/steamapps/compatdata/244210/pfx.lock

1. Set to Proton ver to Proton 5.0-x

2. Run the game, let it crash

3. Install dependencies using Protontricks

   protontricks 244210 -q dotnet48
   protontricks 244210 -q d3dcompiler_43 d3dx11_43
   protontricks 244210 -q vcrun2015 win10
   

4. Change proton version to Proton 6.3-x

5. (Optional, do only when not installing CM) Set launcher option to PROTON_USE_DXVK=1 echo %command%

CM

0. Continue from Assetto Corsa installation

1. Download CM from https://assettocorsa.club/content-manager.html

2. Unzip then copy Content\ Manager.exe to ~/.steam/steam/steamapps/common/assettocorsa/Content\ Manager\ Safe.exe

3. Run the following to create a symbolic link to your steam profile

   mkdir ~/.steam/root/steamapps/compatdata/244210/pfx/drive_c/Program\ Files\ \(x86\)/Steam/config && \
       ln -s ~/.steam/root/config/loginusers.vdf ~/.steam/root/steamapps/compatdata/244210/pfx/drive_c/Program\ Files\ \(x86\)/Steam/config/loginusers.vdf

4. Set steam launcher option to

   ~/.steam/steam/steamapps/common/Proton\ 6.3/proton waitforexitandrun ~/.steam/steam/steamapps/common/assettocorsa/Content\ Manager\ Safe.exe; PROTON_USE_DXVK=1 echo %command%
   

5. Run AC from steam (first run will show an error, ignore it)

6. then put this as path and change <user> to your local username ($USER):

   Z:\home\<user>\.steam\root\steamapps\common\assettocorsa
   

7. Set name and install additional plugins

8. (Optional to improve CM's interface) On CM, setting -> Content Manager -> appearance -> system:

   • Check Disable windows transparency
   • Check Disable hardware acceleration for UI

9. Restart CM

CSP

Warning, installing CSP will cause:

• Keep in mind that Wine+CSP will force to turn down the volume of tyres and surface audio. It will complicate car control because the tires screech will become silent.
• Driver model will disappear, only helmet will remain visible.

0. Continue from CM Installation

1. Close CM

2. Run

   protontricks -c winecfg 244210
   

3. Go to Libraries tab

4. On New override for librart: write dwrite, click Add (it should have the type native, builtin)

5. Apply then close window

6. Open CM from Steam

7. Go to settings -> Custom Shaders Patch to install CSP

8. AT THIS POINT CM WON'T WORK, proceed to next steps

9. Still in settings -> Custom Shaders Patch, find Extensions -> Windscreen FX in the right sidebar, do one of the following:

   • disable completely by unchecking Active in Extension:, OR
   • Remove all the files from ~/.steam/root/steamapps/common/assettocorsa/extension/sfx directory

10. find Extensions -> Car Instruments, disable:

    • Use odometers
    • Navigators for some cars

11. find Extensions -> Smart Mirror, do one of the following:

    • disable completely by unchecking Active in Extension:, OR

    • Open ~/.steam/root/steamapps/compatdata/244210/pfx/drive_c/users/steamuser/Documents/Assetto\ Corsa/cfg/extension/smart_mirror.ini (create if it doesn't exist) then append:

      [PIECE_0]
      ROLE=TOP
      

12. find Extensions -> Fake Shadows FX, disable:

    • Properly project shadows on the ground

13. (Optional because VAO patches are not loaded properly under Wine) find Extensions -> Extra FX, enable SSAO or HBAO+ (this will be very resource consuming)

Issues I ran into

• Can't find INIReader::cache

  Caused by CSP 10.1.79 being bad (ac-custom-shaders-patch/acc-extension-config#316), use another version

• Race cancelled

  Didn't install CSP properly (dwrite wasn't added to libraries)