bin/vgui2.dll
Das ist kein Problem von Wine denn in den Valve FAQ steht:
"This error ("fatal error:could not load module bin/vgui2.dll") typically means that you installed Steam more then one time to different locations without uninstalling the previous install or that you physically moved the Steam folders and are trying to run from the new location.
Players can see this problem (and many other problems too!) if they install Steam directly to their desktop or to one of the Windows temporary directories - not a good idea at all!
There is also a situation where a player gave the Steaminstall program an install path that is confusing (like they told it to install Steam to "C:\" or to "C:\Progam Files".
Its always best if you let Steam install to the default path C:\Program Files\Steam or C:\Valve\Steam (its ok to change the driver letter).
To solve this problem, the best thing you can do is uninstall all current Steam installations using the add/remove option in your control panel. If that is missing or wont work, then manually delete the Steam installation by hand.
If you have only one install of Steam and you have it installed to a reasonable location and want to try a
quick fix, you can try deleting the ClientRegistry.blob file and see if that clears up the problem. If you have any of the situations listed up above then this will proably not fix your problem."