[Xymon] test for existence of directory on Windows

[Jeremy Laidman]

On Thu, Mar 22, 2012 at 12:34 AM, Neil Simmonds
<Neil.Simmonds at express-gifts.co.uk> wrote:
[snip]

In Windows (and DOS), the pseudo-file "NUL" exists in every directory.
 So perhaps look for "E:\dirtest\NUL" and see if that "exists".

J