This is a binary patch of the Vs Holy Quintet mod to make it work under Linux+Proton.
This will only work with version 0.3.0 (because it relies on the exact binary to match.)

Instructions

1. Unzip the game files into a folder.
2. Download the below file (exe.patch.xxd) and save it in the same folder.
3. cd into that folder.
4. Run sha256sum Holy\ Quintet.exe.
   Make sure the value is d86855d5712b10149bf1c7f001d9c30aa5d5af0a6b0f0cbf9c3c6115f9ec82d4, otherwise these instructions will not work.
5. Run

cat exe.patch.xxd | xxd -r -p > exe.patch
patch <exe.patch Holy\ Quintet.exe

6. Open Steam.
7. Click Add a Game > Import Non-Steam Game > from the file picker select Holy Quintet.exe from where you saved it.
8. Once it's added, go to the game properties > Compatibility > Force the use of a specific Steam Play compatibility tool > select Proton 9.0-2.
9. Click "play", and it should work.

On Wayland, you may have to change the game launch options to SDL_VIDEODRIVER="" %command% to get it to work.

Playing

The game will freeze if you

• don't skip the intro
• don't skip the tutorial on Kyoko's level (by pressing enter as soon as it shows up)

Just force quit and reopen the game if this happens, and remember to skip them next time.

Explanation

• The below diff patches the GLSL shaders to include a #version 330 key at the start (otherwise Sayaka's level crashes.)
• Running the game through specifically Steam Proton is required because Steam Proton fixes issues with MediaFoundation that happen with Wine and Wine-GE.
• SDL2 compiled for Windows will still pick up on SDL_VIDEODRIVER=wayland in the environment and crash because it can't locate Wayland through Windows-only syscalls.