[Wine] newbie question: why do I see root directory in wine, when no drive is configured?

[Csillag Kristof]

Hi,

This might be a stupid question; I checked the FAQ, but could not find a 
solution.

In Wine Config, I have only two drives configured:

C: is ~/.wine/drive_c
D: is ~

Still, when I run winefile (or any other wine app), besides drives "C" 
and "D", there is a "/" drive, which is the root directory of my real 
file system.

Why is it still there, even if I don't have any such mapping?
(And how can I disable it?)

Thank you for your help:

    Kristof