There's a Bone in the Mill
Y'a un os dans la moulinette (original)
Two unemployed actors accept what they believe to be an acting job from a wealthy man without realizing that he needs two real private detectives.
Starring Michel Galabru, Paul Préboist, Daniel Prévost, Darry Cowl, Marion Game, Henri Guybet, Christian Marin
It's a comedy movie, and has a rating of 4.3 out of 10 from Imdb which is fairly low for this kind of movie.
Watch it here
Not found streaming from Argentina.