I've resolved my immediate need by using a batch and the filever command below, but it would be better if I could get this working. There will be other reasons to pull info from this namespace and other non-default ones.
for /f %%z in (WorkstationList.txt) do (
echo %%z,
filever.exe "\\%%z\c$\Program Files\Common Files\Microsoft Shared\OFFICE11\mso.dll"
filever.exe "\\%%z\c$\Program Files\Common Files\Microsoft Shared\OFFICE12\mso.dll"
) >> OfficeVer5-21-10.csv