Late night movie on HBO a couple of years ago. Takes place in Paris, and was pretty obviously dubbed, so I’m going to go out on a limb and say it’s French. I can only give a sketchy plot summary, but hopefully somebody will recognize it.
Computer-savvy guy gets recruited by some shady businessmen to work for them. I don’t believe it goes into exactly what he does, but he ends up making them a lot of money. The boss rewards the guy by giving him money and introducing him into society. Along the way he meets THE GIRL and falls for her. Boss gets pissed at him and hilarity does not ensue. The only other specific detail I can remember was THE GIRL showing up at a party wearing a see-through top (sans brassière). That was particularly memorable.
Sound familiar?