The window pictured here is part of a store set...but is the arch effect around the window an add-on or actually part of the window? I couldn't tell by looking at the item located on the store website.
I am looking for a deco item that I can add to an existing window to get the same kind of effect.
Any help is greatly appreciated, thanks!

I have that house and the windows are placed inside the arch from Monte Vista, they don't come with it attached

Thank you so much ; )