seems that 'French-built' might be a bit of an overstatement. Fascinating nonetheless. The French used a lot of German bombers for testing postwar. Notably the He274;
Here's a link I found in my research of that picture a while back if you're interested: Prototypes.com/Le Sud-Ouest SO-4000/III. Les maquettes NC-271 & SO M-1/2 (non translated) Google Translate (same website but translated)