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Python module for applying fixes at runtime for games not supported by Steam Proton

Project description



A module for applying fixes at runtime to unsupported games with Steam Proton without changing game installation files. The idea is to include seperate fixes that are only loaded when a game matching that ID is run. This should keep the individual game fixes from affecting any other games. Applying the fixes at runtime should also them to persist after game updates.

Current fixes include:

  • Final Fantasy IX ✓
  • Oddworld: Abe's Oddysee ✓
  • Oddworld: Munch's Oddysee ✓
  • Age of Empires 2 HD Edition
  • You Need a Budget 4
  • Styx: Master of Shadows ✓
  • Battlefield: Bad Company 2
  • Killer is Dead at Launch
  • Tesla Effect
  • Call of Duty (2003)
  • Age of Mythology: Extended Edition
  • Grand Theft Auto V
  • Order of Battle: World War II
  • Doom 2016
  • Chronophantasma Extend
  • SUGURI 2
  • Forts ✓
  • STAR WARS Jedi Knight - Jedi Academy
  • STAR WARS Jedi Knight II - Jedi Outcast
  • EVE Online
  • Civilization 4 (Beyond the Sword)

(Games with a ✓ have been validated)

Current utilities available:

  • util.protontricks('verb')
    • installs a winetricks verb
  • util.use_win32_prefix()
    • creates and uses a win32 (32bit) wineprefix
  • util.replace_command('original', 'replacement')
    • replaces text in the game's launch command
  • util.append_argument('argument')
    • adds an argument to the game's launch command
  • util.protonprefix()
    • returns the path of the current wineprefix used by Proton


Optional Requirements


If you want to be able to use fixes with winetricks it must be installed and be in your $PATH. Fixes that do not use winetricks will still work without winetricks being installed.

Winetricks can take a long time to load


If you want to use a win32 (32bit) prefix, you need to have wine installed and be in your $PATH. Currently creating a 32bit prefix with Proton wine doesn't work because the wineserver is already running by the time is loaded.


For the splashscreen to work, you need to have cefpython3 installed. It can be installed with pip using sudo pip install cefpython3. The splashscreen can help let you know that protonfixes is running a long task, for example installing dotnet35.

Install from PIP

Make sure to use the version of pip that matches the version of Python that Proton is running. Proton should be running on python3. If you are unsure, try installing with both pip3 and pip2 in the below commands.

# sudo pip3 install protonfixes

Upgrade from PIP

# sudo pip3 install protonfixes --upgrade

Install using setuptools

# sudo python3 install

Add to

In the steamapps/common/Proton* directory, add the following line to the bottom of the file:

import protonfixes

If there is no file, make a copy of the file included with Proton.


Proton output can be seen in either /tmp/dumps/${USER}_stdout.txt or the terminal you started Steam from. To add additional protonfixes debugging information, add the following line above import protonfixes:

from protonfixes import debug

This will add information like this:

ProtonFixes[27351] DEBUG: ---- begin protontricks debug info ----
ProtonFixes[27351] DEBUG: Proton Python Version:
ProtonFixes[27351] DEBUG: /usr/bin/python3
ProtonFixes[27351] DEBUG: 3.7.0 (default, Jul 15 2018, 10:44:58)
[GCC 8.1.1 20180531]
ProtonFixes[27351] DEBUG: ---------------------------------------

Although the environment variables are dumped, the sensitive variables like SteamUser and SteamAppUser are filtered out.

Writing Game Fixes

Game fixes are written in python and are named by the Steam game ID with the extension .py. For example, the file will be loaded when the game FINAL FANTASY IX is run. Gamefixes can be added to the ~/.config/protonfixes/localfixes/ directory. Here are some things to consider when writing fixes:

  • Only import libraries that are part of the Python standard library for portability.
  • Use docstrings and comment thoroughly. There will likely be people without python experience making game fixes and good commented examples will help
  • Do not use any hard-coded paths, Steam may not always be installed in the same location.
  • Check your gamefix with pylint. You can safely disable warning C0103, modules named by Steam ID will never conform to snake_case naming style.


When testing, local fixes can be added to ~/.config/protonfixes/localfixes/. They should be imported the same way as an included fix would be. For example, ~/.config/protonfixes/localfixes/ would be loaded for FFIX. Please feel free to submit working gamefixes to improve the project.

Example game fixes - Changing the executable launched and setting an environment variable

import os
from protonfixes import util

def main():
    """ Bypass the launcher and fix audio

    print('Applying FINAL FANTASY IX Game Fixes')

    # Fix crackling audio
    os.environ['PULSE_LATENCY_MSEC'] = '60'

    # Replace launcher with game exe in proton arguments
    util.replace_command('FF9_Launcher', 'x64/FF9.exe') - Running a winetricks verb

from protonfixes import util

def main():
    """ Uses winetricks to install the ole32 verb

    print('Applying fixes for Forts')

    util.protontricks('ole32') - Example using a win32 prefix

Oddworld doesn't actually require a win32 prefix or dotnet35, but I used it for testing since it's 32bit

import sys
from protonfixes import util

def main():
    """ Adds -interline to arguments, uses a win32 prefix, and installs dotnet35

    print('Applying fixes for Oddworld: Abe\'s Oddysee')

    # Adding -interline fixes slow video but adds scanlines

    print('Using a win32 prefix')

    # Make sure any winetricks are run after changing to a win32 prefix


Pull requests are welcome! If you're not comfortable doing pull requests, send your fixes to me by any other means and you will be credited in the comments.

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