Now, I don't consider this unknown, by any means. In fact, it's pretty well-known, I'd say. If you don't know of it... consider it a "must hear", because it's a synth masterpiece.
I believe there are already mp3s of this are kicking about on slsk, etc, but of the 2 different rips I've found... there is one that cuts short at the end of the b-side, and on the other, the bassline is extremely quiet, which takes away the very part that makes this so great.
So, with that said, I decided to contribute my own rip, as best a quality as I'm capable of providing. Hope you dig it as much as I do. The traditional "hit" is the title track, but I am definitely in favor of the "Plan Actuel". Enjoy!
A - Nuit Des Stars
B - Plan Actuel
P.S. Here's a slightly sped up version of "Plan Actuel", for kicks.