Yes, it's textured, or "pebbled" as I sometimes call it. What you do then is take the frame apart and turn the glass smooth-side-in. Then install the film on the "new inside" per the instructions.
And it's a really good time to paint the window frame. I wish I had thought of it at the time I put the film on. I'd have picked up a can of paint.
http://www.openroadsradio.net/forums...ht=window+film