https://bugs.winehq.org/show_bug.cgi?id=56014
--- Comment #4 from Grigory Vasilyev h0tc0d3@gmail.com --- To run games, you do not need windows steam, games that require steam in proton have a steam_helper. https://github.com/ValveSoftware/Proton
Thus, to run games under your Wine, you need to compile 32 and 64 bit versions: lsteamclient and steam_helper.
Apply these two patches to your wine sources. https://github.com/ValveSoftware/wine/commit/5b5785001537dea33fb3aa93b0e0d0a... https://github.com/ValveSoftware/wine/commit/53ba023e0a3638123c1ae64a070b45b...
You may also want to remove these lines since stemoverlay will probably not work correctly. !RtlCompareUnicodeStrings(basename, basename_len, L"gameoverlayrenderer", 19, TRUE) || !RtlCompareUnicodeStrings(basename, basename_len, L"gameoverlayrenderer64", 21, TRUE)) &&