User extension folderpath

[Thierry Douez]

Hi all,

Is there a function, a property or a global variable
to know where is located the User extension ?

I mean the path which is defined in
    Preferences->Files & Memory  and bottom of the window
                    ( User Extensions:  /Users/<me>/MyLiveCode )

I need this for Mac, Windows and Linux.

Thanks,

Thierry