At the moment it only tests MsiGetFileVersion, because that's the
piece I just found a problem in, but I could easily extend it to have
convenient command-line test rigs for other parts of this setup too.
I don't know why those strange names seemed necessary to start with
and now don't seem to be. I probably changed something subtle
somewhere without noticing.
It's now a sensible source flie containing a set of routines that do
something coherently connected to each other, so it doesn't deserve
that 'fake-' prefix that I used for the previous monolithic files full
of tangled-together stuff.
While I'm here, I've also made up nicer (i.e. more distinguishable)
random magic numbers for the structure-type disambiguation.
