Door and Windows orientation in CWs has never been related to the ground, but to the reference line used to extrude it.
In fact, in an arched CW like your, if you put a series of windows "vertically", you start wit a correct orientation at one end and arrive wit upside down element on the other side. What happen to the top one (horizontal)?.
Well, the REAL difference from standard Doors and Windows an the ones for CW is a special parameter to set the UP direction, related to the direction of the CW surface.
_________________
--Roberto Corona--
www.archiradar.com
AC18 - ITA full on Win10
_________________
_________________