Tried with Proton 7.0-6 (dotnet install has no luck)

...
8082.717:003c:0058:trace:loaddll:build_module Loaded L"C:\\windows\\system32\\imm32.dll" at 00000003AFD00000: builtin
8082.722:0060:006c:trace:seh:dispatch_exception code=6ba flags=0 addr=000000007B01260E ip=000000007B01260E tid=006c
8082.722:0060:006c:warn:seh:dispatch_exception unknown exception (code=6ba) raised
8082.722:0060:006c:trace:seh:dispatch_exception  rax=000000007b0125c0 rbx=000000000106db78 rcx=000000000106d890 rdx=0000000000000000
8082.722:0060:006c:trace:seh:dispatch_exception  rsi=00000000000000c8 rdi=0000000001750230 rbp=00000001c8e1a200 rsp=000000000106d870
8082.722:0060:006c:trace:seh:dispatch_exception   r8=0000000000000000  r9=0000000000000000 r10=c33c3cc3c33c3cc3 r11=a55a5aa5a55a5aa5
8082.722:0060:006c:trace:seh:dispatch_exception  r12=000000000106db78 r13=00000000011f0050 r14=0000000000000000 r15=00000000011f0050
8082.722:0060:006c:trace:seh:call_vectored_handlers calling handler at 00000002279AD660 code=6ba flags=0
8082.722:0060:006c:trace:seh:call_vectored_handlers handler at 00000002279AD660 returned 0
8082.722:0060:006c:trace:unwind:RtlVirtualUnwind type 1 rip 000000007B01260E rsp 000000000106D870
8082.722:0060:006c:trace:unwind:dump_unwind_info **** func 125c0-12647
8082.722:0060:006c:trace:unwind:dump_unwind_info unwind info at 000000007B0A8480 flags 0 prolog 0x11 bytes function 000000007B0125C0
-000000007B012647
8082.722:0060:006c:trace:unwind:dump_unwind_info     0x11: subq $0xc8,%rsp
8082.722:0060:006c:trace:unwind:dump_unwind_info     0xa: pushq %rsi
8082.722:0060:006c:trace:unwind:dump_unwind_info     0x9: pushq %rdi
8082.722:0060:006c:trace:unwind:RtlVirtualUnwind type 1 rip 0000000231B226C2 rsp 000000000106D950
8082.722:0060:006c:trace:unwind:dump_unwind_info **** func 426b0-426f7
8082.722:0060:006c:trace:unwind:dump_unwind_info unwind info at 0000000231B453C0 flags 0 prolog 0x4 bytes function 0000000231B226B0-
0000000231B226F7
8082.722:0060:006c:trace:unwind:dump_unwind_info     0x4: subq $0x28,%rsp
8082.722:0060:006c:trace:unwind:RtlVirtualUnwind type 1 rip 0000000231AE9736 rsp 000000000106D980
8082.722:0060:006c:trace:unwind:dump_unwind_info **** func 96b0-9737
8082.722:0060:006c:trace:unwind:dump_unwind_info unwind info at 0000000231B4332C flags 0 prolog 0x7 bytes function 0000000231AE96B0-
0000000231AE9737
8082.722:0060:006c:trace:unwind:dump_unwind_info     0x7: subq $0x40,%rsp
...
8083.924:0134:0138:err:module:fixup_imports_ilonly mscoree.dll not found, IL-only binary L"UAT.exe" cannot be loaded
8083.924:0134:0138:err:module:LdrInitializeThunk Importing dlls for L"Z:\\---\\SteamLibrary\\steamapps\\common\\US an
d THEM\\UAT.exe" failed, status c0000135
pid 114885 != 114884, skipping destruction (fork without exec?)