Well I spent quite a bit of time trying to track down which, if any service or exe or whatever is actually writing out these temp files.

I did this by simply watching disk activity and what  process was writing out these new temp files.

The best I could figure out, of all the process writing out ANY disk activity, was that it was simply the "System" process that was tied to the particular temp files related to Poser. 

I saw other process such as the disk defragmentor, the antivirus app I DO have running now, search indexer, service host. exe, etc etc etc... basically everything reading or wrting out to the disk and specifically writing these files.

Basically with my browser open right now, and Poser, there's 7 processes actively writing out to the disk.

One of them is simply called "system" and this is what is writing these files.

Unfortunatley that really doesn't tell me too much.

What else have I tried?

Turned off Volume shadow copy + system restore.
Turned off firewall
Booted into a minimal driver mode (not quite safe but basically everything shut off including almost all hardware such as wireless cars, graphic and sound drivers. I started up Poser and still getting these temp files written.

Tried safe mode and now because network was entirely shut off, poser library didn't load at all (in told me a network connection was not avail and couldn't write out library, basically).

Tried turning off search index.

Nothing. Still seeing the files build up.

Baffling :)

You would think there would be a way to actually look at a file and see what process or application or service created the file. That might give some clue as to the path this is all taking. But I'm not smart enough.