How to determine folder access rights?

I need to determine whether an RTC user can create files in a given folder.

On the Classic Client this is easy: IF NOT File.CREATE(<filename>) THEN...

As one could imagine things are not so easy on the RTC because the CREATE function is running on the NAV Server, not on the RTC.

I've spent hours trying to find a solution using Windows Script Host, Microsoft Shell Controls and whatnot, to no avail. I'm really reluctant to create my own automation for such a basic task which surely must be available out of the box somewhere. [-o<