Comment 4 for bug 151162

Similar problem with OS WinXP as well. If you drag the attachment to the desktop you have to keep the left mouse button pressed for some seconds so the attachment is "loaded" (you see a progress bar). Then you can release the button and the attachment is successfull copied. Otherwise (without waiting) an errormessage shows up ("file in use"). You can work with this unconvenience but it is unexpected, not state of the art and contradicts usability a lot (because it took me quite a while to find out).
If you can confirm this behaviour please extend this bug to OS WinXP as well.