for those using windows 7/2008 server with mandatory profiles. i have just found where the jump lists are contained. i.e. adding a user specific word file to a pinned word app on the taskbar or a perticular folder to the windows explorer they are here.
That is annoying when the file cannot be uploaded. Can you copy it to another folder and try uploading it from there or try another browser.
Can you install Unlocker? Then after installing navigate to the file using Explorer, click right on the file and choose Unlocker from context menu. Unlocker will tell if and what program has a handle on the file. You can also use Unlocker to copy the file to another folder so you can try uploading it again VT.