I'm assuming that by "directory" you mean "share". Try this:

open(F, '//nj7001/pdcpublic/saptreasteam/swift') or die $!;
# or
open(F, '\\\\nj7001\pdcpublic\saptreasteam\swift') or die $!;
[download]

If you're still having trouble accessing files with paths like this, perhaps you can take advantage of some Win32 modules to help you?