https://bugs.winehq.org/show_bug.cgi?id=37110
--- Comment #10 from andy andy86@fastwebnet.it --- (In reply to andy from comment #8)
It worked for me a few months ago (see bug 51005) now no longer works with any version of wine i tried.
Maybe some setting in arch linux is related to this?
Solved. If you have the same symptoms keep in mind that things don't work if the steamwebhelper.exe process crashes (see bug 52016 for more info), is not responding or has been disabled in winecfg.