Ok maybe I didn't implement it right, but modifying the Alias in baldur.ini hasn't resolved the issue. Right now my alias looks like this:
HD0:=C:\Program Files (x86)\GOG.com\Baldurs Gate II\;C:\Program Files (x86)\GOG.com\Baldurs Gate II\data\Data\
CD1:=C:\Program Files (x86)\GOG.com\Baldurs Gate II\data\;C:\Program Files (x86)\GOG.com\Baldurs Gate II\data\Data\
CD2:=C:\Program Files (x86)\GOG.com\Baldurs Gate II\data\;C:\Program Files (x86)\GOG.com\Baldurs Gate II\data\Data\
CD3:=C:\Program Files (x86)\GOG.com\Baldurs Gate II\data\;C:\Program Files (x86)\GOG.com\Baldurs Gate II\data\Data\
CD4:=C:\Program Files (x86)\GOG.com\Baldurs Gate II\data\;C:\Program Files (x86)\GOG.com\Baldurs Gate II\data\Data\
CD5:=C:\Program Files (x86)\GOG.com\Baldurs Gate II\data\;C:\Program Files (x86)\GOG.com\Baldurs Gate II\data\Data\
CD6:=C:\Program Files (x86)\GOG.com\Baldurs Gate II\data\;C:\Program Files (x86)\GOG.com\Baldurs Gate II\data\Data\
But BWS still can't find the area090a.bif. I have also tried copying the .bif to just \data\ with no luck. What am I doing wrong?