I thank you for your will to fix it! So, the issue is even more complicated. I found the openxr package on the AUR, but it doesn’t install for some mysterious issues
-> Failed to install the following packages. Manual intervention is required:
openxr-loader-git - exit status 5
I did do the LD_PRELOAD with multiple files - which works with semicolons (I forgot how environment variables worked smh), thing is… I assumed it’s also in the thirdparty folder, so this is what happened:
[surillya@americansuri linux-build-5]$ ./launch.sh
ERROR: ld.so: object '/home/surillya/Downloads/linux-build-5/thirdparty/KTX-Software/libktx.so.4;/home/surillya/Downloads/linux-build-5/thirdparty/OpenXR-SDK-Source/src/loader/libopenxr_loader.so.1' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
./Runtime: error while loading shared libraries: libktx.so.4: cannot open shared object file: No such file or directory
So, I got the same libktx error again, and another (I have honestly no idea what it means with “shared object file”), but so I looked for the file in the first place, but it doesn’t seem to be shipped :o
So maybe - I either need that file / those files, and / or LD_PRELOAD has an issue with multiple libraries or something - actually, I just tried again, using space instead of semicolon, and the issue changed again, I think now it just means that libopenxr_loader.so.1 is missing:
[surillya@americansuri linux-build-5]$ LD_PRELOAD="/home/surillya/Downloads/linux-build-5/thirdparty/KTX-Software/libktx.so.4 /home/surillya/Downloads/linux-build-5/thirdparty/OpenXR-SDK-Source/src/loader/libopenxr_loader.so.1"
[surillya@americansuri linux-build-5]$ ./launch.sh
ERROR: ld.so: object '/home/surillya/Downloads/linux-build-5/thirdparty/OpenXR-SDK-Source/src/loader/libopenxr_loader.so.1' from LD_PRELOAD cannot be preloaded (cannot open shared object file): ignored.
./Runtime: error while loading shared libraries: libopenxr_loader.so.1: cannot open shared object file: No such file or directory
At least that’s what I think it is… Don’t take my word for it though.

So that doesn’t seem to work? What Proton do you use? I also tried both soda and syswine in bottles, not giving anything at all, so I tried the wine shell, giving me this: