virtual directory from network drive (on PWS 4.0)

in pws 3.0 i can create virtual directory for my web like this :
virtual directory : \myfolder
physical directory : e:\
where e:\ = \\othercomputer\sharedfolder

how can i do like that in pws 4.0 (because i have to get the file in other computer to publish via my internal web server)

thanks