Well...I couldn't figure out how to get VampEd to extract the files.
But what I realized (unless I accidently extracted the files and didn't realize it) that the necessary file was already un-extracted by having applied the unofficial 3.2 patch. So I made my backup copy and figured out who was what, sorta. I'm still not 100% sure what all the models are called, but once that's sorted its easy to do...
Well I played around a bit more with this with some free time. It looks like a number of the "common" skins don't seem to work, possibly because they weren't in the game proper (the one I remember distinctly was a female hunter in the Society of Leopold folder...but I don't remember seeing any female hunters there).
Or I'm doing something wrong. Entirely possible!
Which also makes me think of something gameplay related - on the back of the box there is a shot of the main character talking to a female vampire(?) in a cowboy hat. It appears to be in the Confession Club in Downtown, but I don't remember ever seeing a character fitting that description. Did I miss something (easily possible, as I've only played through once), or was something removed from the game?