Network path with urlRequest?

Hi,

I try to load a file over the local network with Loader Class but I get the error "URL Not Found".

I use a path like this  "file://///myPCnetID/pubilcFolder/pictures/mypic.jpg" which refers to a folder on the same PC I compile and run the Air flash file.

When I copy the adress into the browser the jpg-file ist displayed corretly.

Any Ideas? TIA!