It was done for the IMAX documentary on special effects called Special Effects: Anything Can Happen
I saw it a few times in the Air and Space Museum in Washington DC back in 96 or 97 or so. It was really cool. The shot of the Falcon blasting into hyperspace at the end was mindblowing.
It is a shame that this hasn't been released ever.
The imdb article is helpful: http://www.imdb.com/title/tt0117709/