accessing files from mapped drive from another server

Hello NG, I need to access files via PHP from another local server. For security-reasons I need to access them throught their physical path (e.g. C:\path\file.txt) and not through a virtual path (e.g. http://domain/path/file.txt). Therefore I mounted a drive ("F:") to access those files (e.g. F:\path\file.txt) however this won't work. For php this mounted path simply seems not to exist. both servers : win 2k IIS5, PHP 4.3 Anyone any hints? Thanks, Marc