Any player you may be using does not actually hold any files.
The playlists and library in your player are just links to where the files are really located.
You can test this by moving a file to somewhere else and then trying to launch it from your player - it won't be able to find it 'cos you moved it
... don't forget to move it back.
The same applies to specifing the shared folders. It must be the true location of the files.
Hope that makes sense