URLRequest with unmapped network drive

[jspears]

Hello all,
I'm using Flash CS6 outputting to AIR to work on a shared network (not internet). I am trying to reference some files on a shared office server drive. I would usually just reference the mapped drive G:... but due to the amount of people using this, I cannot guarantee that everyone will name the server drive using the same letter. So, I need to reference using the long server name.

Trying but failing (Main question is how to properly write this... if possible):

var req:URLLoader = new URLLoader(new URLRequest("//serverName/rest-of-path-here"));

instead of (which works for properly mapped):

var req:URLLoader = new URLLoader(new URLRequest("G:/rest-of-path-here"));

I get the following error:

Error #2044: Unhandled ioError:. text=Error #2032: Stream Error. URL: //serverName/rest-of-path-here

Thanks in advance!
-Jake