Well do not I feel stupid. The fustil documentation was not that clear,
but I see there are two ways to query a volume now.
fsutil 8dot3name query volume
fsutil behavior disable8dot3 volume
Which helps me a little, though my true aim is some API call (or even
using COM) to query a particular volume's setting. For an installer
which uses a rather old Microsoft interface (Video for Windows, VfW),
and will only install correctly if shortname generation is enabled.
I am sure I could somehow add in an ugly call to fsutil and then parse
the output... but looking for something a little less cumbersome.
Searching the MSDN though just keeps pulling back to the page
identifying the registry value, or fsutil docs.