[Bug 23515] New: All Steam installations fail

http://bugs.winehq.org/show_bug.cgi?id=23515

Summary: All Steam installations fail
           Product: Wine
           Version: 1.2-rc5
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

As of either the client update or the move to -rc2 (I've tried it in every -rc
from 2 until now), I cannot get installation of any purchased game on Steam to
work.

Any attempt to install an application prints these errors on the console:

err:ole:CoGetClassObject class {9a5ea990-3034-4d6f-9128-01f3c61022bc} not
registered
err:ole:CoGetClassObject no class object {9a5ea990-3034-4d6f-9128-01f3c61022bc}
could be created for context 0x1

and then Steam exits with error code 1.

I duplicated this trivially by moving my .wine directory away, installing a
fresh instance of Steam, and attempting to install any already-purchased game. 
It immediately generated the same error.

Of course, this used to work at some point (considering Steam's Gold status at
the moment).