What is it and what does Poser use it for?

At any rate, it's about 12 gigs on my 60 Gig SSD C: drive and is a major space hog. What happens if I delete it?

On a related note:

I have just purchased a second SSD for my Poser machine and I am of several minds as to how to use it. It's 128 Gigs. My total runtimes are 110 gigs, and (between my slowed buying and a planned purge of things that are poor quality/outdated) not likely to become significantly larger any time soon. Would I do better to put the runtimes on the SSD from a performance standpoint, or put the Poser Temp File there along with the Windows paging file?

I'm running Windows XP 64 and Poser Pro 2012.

All opinions appreciated.