My guess is that Wow32 (running x86 application on x64 platform) is not supported as mentioned on MSDN if I am not mistaken. On x64 platform you should link against the 64-bit version of the VSS library.
What is the chance of getting a production version any time soon you wonder? Well, good question actually, since it has been Beta for quite some time, and if I'm not mistaken just about nothing has happened to the library since then.There is currently one
open issue, and two minor impact tasks (verifying documentation and creating sample applications) for version 1.0 final. I was hoping to get some bugs fixed from the beta to the final, but either there aren't any (yeah right ;) or they haven't been discovered.
If I were to release a final version today the only change from the beta would likely be minor alterations to the documentation and perhaps some improved samples. So I'd say the library probably is of production quality, and maybe the final should be released
just to signify this.
Then of course support for Windows 7 and Windows Server 2008 R2 could be added, but that is more like something to do for the next version.
But I will try to get a final released pretty soon, but don't expect any major changes (or much changes at all) from the current beta though.