A long time ago I watched a movie in which Nazi Germany didn't lose WW2, but made some peace agreement with western allies. The movie was set in Berlin on Hitler's 80th (?) birthday. Does anyone have any idea what this movie is called?
That sounds a lot like "Fatherland", a book by Robert Harris that was turned into a TV movie of the same name in 1994 starring Rutger Hauer.
The book is set in the week leading up to Hitler's 75th birthday though, not his 80th. Very good book, but I haven't seen the TV movie.