Currently I tried 1.8.1 and 1.10 beta - I have got "The specified version was not found" error.
I had the same problem this past weekend. I added the following line into the vixwrapper-config.txt file found in "C:\Program Files (x86)\VMware\VMware VIX" for 64-bit host and "C:\Program Files\VMware\VMware VIX" for 32-bit host:
player 9 vmdb 3.1.0 Workstation-7.0.0
Place this line in the # Workstation 7.0.0 heading, just below the line:
player 9 vmdb 3.0.0 Workstation-7.0.0
Check this community post: http://communities.vmware.com/thread/270489?tstart=0
Your issue is similar to the one reported in that post.
-Thanks
Sankar.