I have been using skydrive to make updates to excel files via multiple PCs for a few years.  I just bought a surface 2 have been using it to modify the same files that I was modifying on my PCs.  At first it was working great but recently I have had a number of instances where multiple copies of the files are being created with the PC name at the end.  I know the file isn't open on any of the other PCs or the surface.