Can DIRECTORY be on another host

We moved an apps backend(11gR2) db from the app server (Windows) to a stand-alone db server on Redhat.    In the app, it has a procedure that reads/writes to the defined DIRECTORY object c:\temp.

We changed the directory variable to now point to \\host\temp and on the windows box made c:\temp a share however this is not working.

How can we get a Linux db server function to read/write to a windows box? 

I was looking at a simple solution however is may mean the we need to either setup SAMBA smb.client on the linux box to access the windows share or vice versa.