This morning I got on my computer to find my C drive had gone from 20 gigs free to 20 megs free. I started snooping around folders (since windows is a horrible operating system and doesn't make it easy to see a log of what things ate up HD space) and found a folder in xampp:

c:\xampp\tmp

it's filled with 26 gigs of .tmp files.

1. why did this happen?
2. is it safe to delete all of it?