Working With .net And Librarian Itemid? Follow

For our printing system it would much easier to handle the formats internal via itemID or nameID or GUID.... and not with the file/path name.

With:

            Library library = new Library();

            LibrarianFolder folder = library.GetFolder("lib://");

I have only access to the file name or or the path. 

I saw in the BarTenderSysDB the table LibItems with the PK ItemID.

Is there a easy way to link the file name/path to this ItemID?