HI!

First, please forgive my ignorance about Linux installs - the Steam Deck is my first experience of Linux, so the errors could just be my incompetence, and also they could be specific to Steam OS.

I'm installing the regular version of Arma 3 & DayZ from my Steam Library.

With Arma 3, after installing to the Steam Deck, and starting the launcher, it downloads the mods I'm subscribed too, as you'd expect. When it's done, the mods are marked as corrupted. When I looked in the !Workshop Folder where I'd expect to see the shortcuts to where the mods actually stored, the !Workshop folder seemed to be empty, with no shortcuts, but the mods were in the content folder as you'd expect. It's like the problem is something to do with the shortcuts not be created in the !Workshop folder.

HOWEVER! Even if the launcher worked on the Steam Deck, because of the restricted storage on the Steam Deck and other hand-helds, I know the I, and most other users, don't really want all my subscribed mods downloading to my Steam Deck and filling up a big chunk of my storage. (I have 100gb of Arma 3 mods), so it would be nice to be able to select which mods I'd like on my Steam Deck instead of them all downloading automatically, but also so that those mods I have chosen are then automatically updated by the launcher.

Unfortunately I can't send you photos / video at the moment because I uninstalled Arma 3 from my Steam Deck - but if it helps I can reinstall and send you video of the issues.

Thanks, Rob.

!Workshop folder seemed to be empty, with no shortcuts

That was actually one bug we originally had. But we specifically fixed that.
We will revisit that

so it would be nice to be able to select which mods I'd like on my Steam Deck instead of them all downloading automatically

We are blocked by Valve on that. We don't have control over that, Steam does it by itself.

But actually Valve is already solving that. The Steam Beta client lets you select which workshop items to actually download, inside the game properties.
It might not play well with the Launcher currently. We are already investigating that, we'll also have to make that work right on windows.

Figured something out.
The !Workshop folder is actually not needed. The Launcher has a fallback for when creating the links inside !Workshop folder would not work.
We know it has issues in Proton, but its actually not activating that fallback.
Next Arma update we will enable the fallback. !Workshop folder will never be created but the mods will be loaded directly from Steams content folder.

We would have some trouble testing this. Maybe you can help test it for us?
in Arma 3\Launcher there is a Utils.dll
Replace it with this one.

Don't have Arma3 so I tried this DLL on DayZ on Linux in the hopes it would be the same, but doesn't seem like it. Just get an empty error window for a second, logs complain about a missing method. If you upload another DLL for DayZ I can test that.

Just for reference in case it is relevant after all, this was the error:

[ERROR] FATAL UNHANDLED EXCEPTION: System.MissingMethodException: Method not found: bool Utils.PrerequirementsStatus.get_VisualCRuntime2015_X64_Installed()
  at SharedResources.ApplicationBase..ctor (System.String appName, System.String appId) [0x00071] in <31230c09dd794a098d6c43fb11ca195e>:0 
  at Launcher.App..ctor (Launcher.InitArgs initArgs) [0x00000] in <740307b6d99a4c97b580cfaa8fd3234d>:0 
  at Launcher.Program.StartGui (Launcher.InitArgs param) [0x00078] in <740307b6d99a4c97b580cfaa8fd3234d>:0 
  at Launcher.Program.HandleCommandLine () [0x000e3] in <740307b6d99a4c97b580cfaa8fd3234d>:0 
  at Launcher.Program.RunLauncher () [0x000d4] in <740307b6d99a4c97b580cfaa8fd3234d>:0

P.S.: Not OP, I'm sure @scalespeeder will be able to test this on Arma 3.

Hi!

Sure, no worries. I'll have a go over the weekend and report back.

Thanks, Rob.

Hi!

Happy to report that dedmen Utils.dll fix did indeed work, the Arma 3 Launcher on Steam Deck recognized the location of the mods. Bravo!

Here's my test:

https://youtu.be/PkfHbRZZ0Nk

Well done! Could you please share this info with the DayZ team, as their launcher has the same problem.

I assume this fix will be put out with an update?

Thanks again, Rob. (scalespeeder)

Arma 3 fix will be in 2.16 update.
DayZ Team has been informed. Thank you!