[Wine] Change wineprefix after brlcad installation

[NoOp]

$ apt-cache policy wine
wine:
  Installed: 1:1.7.26-0ubuntu1~ppa1
  Candidate: 1:1.7.26-0ubuntu1~ppa1
  Version table:
 *** 1:1.7.26-0ubuntu1~ppa1 0
        500 http://ppa.launchpad.net/ubuntu-wine/ppa/ubuntu/ trusty/main
amd64 Packages
        100 /var/lib/dpkg/status
     1:1.6.2-0ubuntu4 0
        500 http://us.archive.ubuntu.com/ubuntu/ trusty/universe amd64
Packages
gg at g:~$ wine --version
wine-1.7.26

I have a bit of an odd problem; a short while back I installed brlcad
(<http://brlcad.org/> (brlcad_7.24.2-0_amd64.deb). I later purged
brlcad. However I now notice that my wineprefix seems to have been set to:
/home/<user>/.wine:/usr/brlcad/bin/dosdevices/
(note the ':' colon after .wine)

and I can't seem to change it back to ~/.wine

I've checked my .bashrc:
export WINEPREFIX=$HOME/.wine
my /etc/environment:
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games"

Windows registry is also showing brlcad in \Software\Wine\MenuFiles

If I delete ~/.wine: and run winetricks, winetricks automatically
recreates ~/.wine:/usr/brlcad again.

Any ideas how I can rid Wine of /usr/blrcad? (btw: there are no existing
brlcad files/folders/directories on the system any longer - including
/usr/brlcad)