By some incredible coincidence, several hours after that last post and while I was snoring my little fat head off in bed, my PC downloaded two files by the name of "C'était un rendezvous"!
One turned out to be a poor quality copy of the second half of "Intolerable Cruelty" with George Clooney and Catherine Zeta-Jones. I half watched it and it looks like a garbage movie to me, but she is quite pretty, for a welshman. God only knows why someone mis-named the stupid thing - there are some weirdos about on file-sharing sites - I know, I know, I am there too!
However, the other, smaller file appears to be the real thing.
It is an .AVI, it's 61MB in size and it's not very good - dark, indistinct and not very exciting. Nice sound, though otherwise disappointing.
I am pleased I didn't pay £15 for an original DVD, that's for sure!
If anyone wants it and we can work out way of getting it to you, you are very welcome.