Subject: Win mapped network drives

Hi, on a extranet server (Win2k) a network drive is mapped and accessible as H:\. From PHP5 I cannot access this mapped drive using fopen(). Using the full network path the same situation. So, now I was forced to have all dirs on the local machine and then use a script / automated tasks to copy files to the right path :(
Who knows how to access a shared dir on another server? Both server machines are running Win2k