Yes more then likely its a 'Ghost File'.. the way to know the difference is to do a browse.
Click the 'Show Full Path' button..
Now check the path of the files in question, they usually dont match the normal files. see example below
You'll notice on the example below there are many Drive Letters showing, this user actually only had one drive and it was C drive.
None of the files showing below where actually on this users machine at all, refreshing the connection removed them all.
The way to get rid of the files showing is to have the person your browsing to refresh thier connection, they are usually users that are on secondary and finding a new primary usually makes them disappear.