

Launching with ProtonGE fixed audio stuttering and media not playing correctly

Plays perfectly, but proper cinematic playback seems to require at least Windows Media Player 11 via Protontricks.
Windows Media Player 11 (wmp11)
Only a combination of ProtonGE plus WMP 11 via Protontricks allowed the cinematics to play without any audio distortion for me. The solutions suggested here by other testers either did not fix the audio distortion, or resulted in all videos being skipped automatically.

Changed config to remove comic border and widescreen effects

taskset -c 0,2,4,6 %command%
crackling sound is videos, Proton GE fixes is
Game engine problem, use tasket

So muda a resoluçao(Fica em 700p)
Em algumas partes o audio trava mas a maioria é normal

I needed to use Proton GE, cuz otherwise had problems with playing cutscenses (sound crackled).

-nologos
To increase the FOV I modified steamapps/compatdata/204450/pfx/drive_c/users/steamuser/AppData/Local/techland/cojgunslinger/out/Settings/Video.scr and added the line "ForcedHorzFov(100.000000)" (note: modifying settings in-game overwrites this file)
Cutscenes crackle as others have mentioned. I did not want to turn off VSync to see if that helps as the menu runs at over 4000 FPS and makes my GPU scream. DXVK_FRAME_RATE instead of VSync did not help either for these audio issues.
Outside of the cutscenes all is fine!

Cutscenes dont play with regular proton. Works with protonGE 9-22
Cutscenes dont play by default. Used protonGE9-22 and everything works perfectly

Will work except for audio issues.
Cutscene video is fine, audio is busted.
Silas never comes back after Episode 8 on the train, leaving me perma stuck in bullet time, progress is bricked.

Proton Wine GE 8-26
Works after installing wmp11
download MP10Setup.exe from archive.org/download/WMP10Multi
winetricks change prefix to windows xp and install MP10Setup.exe
Then all movies and game works.

DXVK_FRAME_RATE=60 mangohud %command% -nologos
DXVK_FRAME_RATE=60 mangohud %command% -nologos
Had to downgrade Proton to GE-Proton9-16 to make it work. GE-Proton9-20 could not launch it.

The game runs well out the box with the latest Proton version (9.20) but there are no cutscenes with such settings. The cutscenes are vital important for this game as they play a crucial role in the narrative, revealing the story and advancing the plot. The only way I made it work was switching to the old version of Proton GE, for instance 7.27 and installing wmp package via Winetricks GUI.
During 4-hour game session, the game hangs twice. The only way to continue playing was to kill the process and restart the game from the latest save.
There are no cutscenes with latest version of Proton

Download and Play
I played the game from start to finish and didn't have a single problem.
Works out of the box
Works out of the box. The game has a problem with Windows 11 and won't run on it, so it is one of the only games that only runs on Linux.

DXVK_FRAME_RATE=60 mangohud gamemoderun %command% -nologos
Windows Media Player 11 (wmp11) or a prior version needs to be installed for cutscenes to play. However, this is handled automatically by Proton-GE, so no manual fix needed. (See https://github.com/Open-Wine-Components/umu-protonfixes/tree/master/gamefixes-steam/204450.py.)
Windows Media Player is required for cutscenes to function properly (both video and audio).
Cross-platform information: add the "-nologos" launch option to skip the introduction videos. Also see the PCGamingWiki for further tweaks.

After much pain, finally got cutscenes fully working:
- Set compatiblity tool to Proton 5.0-10.
- Delete the wine prefix, then run the game once to force a clean 5.0-10 prefix. (Wine does not necessary downgrade prefixes cleanly.)
- flatpak run com.github.Matoking.protontricks 204450 win7 wmp9 (Click through the various prompts. The WMP GUI installer will claim to have failed, but it installed what you needed.)
(Perhaps something newer than 5.0-10 will work, but many recent versions of Proton blackscreen when starting the game after installing wmp9.)
This should make cutscenes completely functional. All of them (unlike Proton Experimental). With sound (unlike ProtonGE). Without audio crackle (unlike Proton Experimental).
To verify it's working: An Ubisoft splash screen should be the first thing you see when starting the program.
For configurations other than "old Proton + wmp9," cutscenes either don't play, play without audio, or play with crackling audio. "Old Proton (5.0-10) + wmp9" resolves the issue.
For configurations other than "old Proton + wmp9," cutscenes either don't play, play without audio, or play with crackling audio. "Old Proton (5.0-10) + wmp9" resolves the issue.
The cutscenes are important. Sure, it's a servicable first person shooter, but the real point of this game is as a work of narrative fiction that toys with what an interactive format enables the author to do with an unreliable narrator. The cutscenes are crucial to the narrative.
So, I'm kinda annoyed at the large number of incorrect reports on ProtonDB. No, it's not platinum; the cutscenes don't work out of the box. Most of the suggested tinker steps are either wrong, incompletely described, or incompletely fix the cutscenes.

Pre-rendered cutscenes won't play
Other than that the game runs out of the box as it would on windows. The in game cutscenes do play without any issues but not the pre-rendered ones.

None
-> works like butter

Perfect
The game runs smoothly

Locked FPS to 45, perfect balance between smoothness and battery life
2D cutscenes didnt have proper audio, it crackled alot but during gameplay all audio was perfect
Apparently unlocking FPS fixes cutscene audio issues but i havent tested it myself

Wouldn't launch without changing the proton version

WINE_CPU_TOPOLOGY=31:0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30 %command%
Doesn't launch on my 5950X without a core count limit. Despite this, the game works like a charm.
heavy fps down (10, 25) compared to win ver (40, 50 on a G3220 4gb ram

Wmp11
Edited Video.scr to remove the comic border and letterboxing (see PCGamingWiki for details)
Works out of the box, no issues, even on Intel ARC
Audio crackling in cutscenes. Fix: Deactivate FPS Cap and set refreshrate to 60 Hz.
Runs perfectly out of the box

The cutscenes were not working for me (TV static instead). None of the previously mentioned solutions worked. With Proton GE, the cutscens were showing up but there was no audio. The only thing that worked was installing WMP11 through protontricks. Just run the following command in the CLI after installing the game:
protontricks 204450 win7 wmp11
After this the game should work with Proton GE. If you get "command not found" message, make sure to add an alias for protontricks (or replace protontricks with "flatpak run com.github.Matoking.protontricks" in the previous command):
echo "alias protontricks='flatpak run com.github.Matoking.protontricks'" >> ~/.bashrc
No cutscenes by default
Audio seems to be busted on Steam Deck. Tested with GE and Proton 8.
The actual game runs great, audio works as expected during gameplay, but during any cutscenes (such as those after levels) are completely broken. Audible crackling noise.
Turning off the FPS caps in Steamdeck options fixes the audio crackling during cutscenes, Game ran just fine after than.
works out of the box
can be fixed by capping the framerate to 60 fps or disabling v-sync on higher refresh rate monitors
feels like native linux game :)
Game would not launch without launch option "taskset -c 0-4 %command%", ran perfectly fine after setting that
taskset -c 0-4 %command%
some slight crackling in the first few cutscenes, but good after that
Switch to Proton Experimental to get audio in cutscenes.
Disable Vsync and remove fps cap from steam during cutscenes, audio is fine at 60fps otherwise
Set Video > Vertical Syncronization to "OFF" in the game itself, and in the Steam Deck Performance settings, set the Framerate Limit to "OFF"
Audio crackling was present when using the default settings. By turning vsync off in the game and frame limiting off in the Steam Deck performance settings, the crackling went away.