gistfile1.as

// machine host name required for uri
var host:String = mdm.System.Registry.loadString(3, 
	"SYSTEM\\CurrentControlSet\\Control\\ComputerName\\ComputerName", 
	"ComputerName");
// share name
var share:String = "myfolder";
// folder absolute path converted to URI path (strip volume root)
var folderPath:String = mdm.Application.path.substr(3);
// construct full path
var uriPath:String = "\\\\"+host+"\\"+share+"\\"+folderPath;
lbl.text = uriPath+"(exists: "+mdm.FileSystem.folderExists(uriPath)+")";