Allow creating shared wineprefixes

[DragoonAethis]

Currently, Proton creates a separate wineprefix for each and every game - while this is very good for most titles, there are some that can read saves from other titles and change their behavior based on that. For example, you can carry over your character and choices in Mass Effect or The Witcher.

[nstgc]

You can symlink your user data. For Mass Effect, for instance, I have it pointing at the bioware directory in my home directory (~/Documents/My\ Games/Bioware if memory serves me).

[DragoonAethis]

That's certainly possible, but many future Steam Play users (once it goes out of beta) won't be able to do this (either because they lack skills to do so, knowledge of which files are needed to be symlinked where, or lack of out-of-box terminal access on devices like Steam Machines). This should be possible to specify per-title to make Steam Play a bit more transparent to the end user.

[nstgc]

True enough. . .I think the real solution is to automatically symlink steamuser to ~/. . .or something like that.

[thunder1410]

Maybe make a sysmlink the (my) documents folder for every game to for example /home/.steam/steamplay/MyDocuments?

[hmlendea]

Just dropped here to show my support for having this available out-of-the-box.

TL;DR Symlinks and manually copying files is not always an option, or as easy as it might sound. Others already mentioned this, but here I come with another example.

A few days ago I wanted to play The Walking Dead: A New Frontier (Season 3) on the TV with Remote Play (Steam Link) while being in my hometown for a few weeks and had to go through the pain of:

• Opening the laptop I brought with me just to copy the save
• Connecting to my home VPN so that I can access the local (home) network
• Copying the files via SSH to my desktop back home

And it all worked out because of luck. Thank God I had SSH configured for my local network back home, and a VPN to access that network.
The average user wouldn't have known how to do this, and I'm pretty sure only a handful of people have all this infrastructure in place already.

Oh, and I would have had to do it for Season 2 as well, but thankfully my old laptop is "powerful" enough to handle a game that old, so even tho it spewed fire I still preffered it over copying the files remotely. But I'm gonna have to do it for Season 4 soon.

Now if the prefix for all 4 TWD games was shared, all I would have had to do would have been to simply install S2 alongside S3, et voilà. All doable quickly and easily within the Steam Link app and using just the gamepad.

[jebez1]

The solution:
LAUNCH OPTIONS: STEAM_COMPAT_DATA_PATH=proton_prefix_path %command%

See the link above.

[SomeoneIsWorking]

True enough. . .I think the real solution is to automatically symlink steamuser to ~/. . .or something like that.

One of the things I don't understand about separate prefixes is, in a Windows PC, you install all the games in the same system so why is the default behavior creating separate systems?

I know about that some prefixes are 32bit and some are 64bit and some prefixes require some library configurations but honestly these issues should be resolved instead of keeping the current architecture...