When I was trying to delete a file I got a strange error:
"Could not find this item. This is no longer located in..."
After some investigation I found the following solution:
1) Open a command prompt
2) Go to the folder where is the located the problematic file:
3) Type the command:
4) Find the 8.3 filename
5) Delete the file using the command:
And bingo...the file is deleted !