but I created completely transparent windows for the C172R. It's a simple edit: I first tried to keep some of the dirt on the edges but it didn't work out too well (maybe I will give it another try later on) so in the end I simply knocked out the windows completely, you could say. 
(EDIT Everything else that's in the edited file is still there: only the windows have been edited!) For anyone who is interested (there always are more people interested in this that you'd expect!
), here is a link to the file:https://dl.dropboxusercontent.com/u/185 ... _glass.zip
Readme is included.
Enjoy!
P.S. My main reason for removing the reflection is that they simply don't look like reflections when you use TrackIR: they look like stickers on the windows and for me personally they spoil the immersion and the sense of being there. Obviously this is a very subjective thing. Apart from that I also like to see the scenery in all its glory and not with a grey filter over it, no matter how realistic that might be.
