No one? Finally had time to google. Found answer here:
http://unit.aist.go.jp/itri/knoppix/...n/index21.html

Next time you start Knoppix, it will detect and use the swap file automatically. To remove the swap file and reclaim the disk space it occupies, exit Knoppix, start Windows, then delete the file "knoppix.swp" using Windows Explorer.