Believe that as you are using "", this might be treated as an escape, try giving forward slash / or append the "" with another "".
like \\machine_name\Folder_name\File_name, this will be treated as \machine_name\folder_name\file_name.
Is the machine accessible from the IS??
HTH
Malhar
#Integration-Server-and-ESB#Flow-and-Java-services#webMethods