They are local files on a local (USB) printer with windows 7 64bit.
Are you working from windows 7 ? - yes 64x
OR is your problem on Server 2008? they are from network drives based off a x64 server 2008
OR are you navigating to a network share or DFS share hosted on Server 2008? yes
OR is the printer hosted on Server 2008 (locally or via the print server role).
Or something else yes printers are also hosted off 2008 server
I'm a little confused as to your set-up; but I'm happy to test on a copy of Server 2008 here if you explain it.