Ral400

anyone know what this file does? And how to delete it or not be fragmented?

I clicked on "File List" and put a check mark on top, near "Filename". The defragging went great. It went up to the 60% range. When the defragging reach somewhere in the 60 area, it said this: "Defrag Aborted Some files were not defragmented This operation cannot be done" Any ideas on how to fix this problem?