NotProton

# NotProton

NotProton enables the Steam Play experience from Linux Steam in the macOS Steam client.

This is done by forcibly enabling the Steam Play functionality in macOS Steam (which is
present and inert) as well as by porting some components of Valve's Proton to macOS.

This tool is intended to be used with the stable Steam Client (version 1794424036) as well as the beta Steam Client (version 1792626604) paired with **CrossOver 26.3 or CrossOver [Preview](https://www.codeweavers.com/preview)
20260821 / 20261006 / 20261015**, with more supported versions to come.

**Tuxera NTFS is not supported. Tuxera has a bad bug that causes corruption. I've reported the bug to them. If you need NTFS, Paragon NTFS may work better, but I have not tested it. I will be implementing a work around for this (horrible) bug soon.**

Supporting specifically CrossOver is a design goal of this project. Better support for modifying CrossOver (using custom builds of DXMT/patched D3DMetal/MacGameVideoFix) will come in a future update, but support for alternatives to CrossOver itself is not planned.

Both the FEX and the Rosetta versions are supported. I recommend using the FEX version of the 
Preview 20261006, as it includes both the FEX version as well as the Rosetta one. 

I further recommend going into Steam Settings - Compatibility and selecting the Rosetta version as your default compatibility tool. You can select FEX on a per game basis by right clicking a game in Steam, going into Properties - Compatibility and selecting FEX there.

If a game has a native macOS version as well as a Windows one, Steam will download the macOS version. To override this behavior, right click on the game, select Properties, select Compatibility. Enable 'Force the use of a specific Steam Play compatibility tool'. Select whichever version of CrossOver you want to do use. That will make Steam download the Windows version. Unchecking the 'Force the use...' box or selecting 'No Compatibility Tool' in the drop down list will revert to the macOS version of the game, with the specifics there varying based on your Steam version.

**Valve Anti-Cheat is not supported.** Proton itself does not support VAC in Valve titles; Valve ships native Linux ports instead. VAC titles will launch in Insecure Mode and will not allow matchmaking. 

**This project now has a brew cask.** For brew users, you can install via ``brew install --cask notprotonnot/notproton/notproton``

Please read NOTICE for license information.

Please open issue reports with any issues. PRs are welcome and encouraged.

There are many people who worked on similar ideas, similar projects. I did not base NotProton on their work, but I still want to 
give thanks to the people who came before me:

[Nat Brown](https://github.com/natbro) made [Kaon](https://github.com/natbro/kaon), which is similar in goals to NotProton.

mont127's [Neutron](https://github.com/mont127/Neutron) is also a similar idea, but implemented differently. 

[Gio](htt