Here are some suggested bikes routes in the Dordogne based on the GPS tracks used for the Périgordine sportive.
La Périgordine is an annual sportive held locally from Montignac, in the Dordogne. The area is famous for the Lascaux pre-historic caves, which are a must-see (the area was included on the 2017 Tour de France route to celebrate the caves).
These routes are based on those used for the sportive. They may differ slightly from year-to-year (these GPS tracks are from 2018), but they nonetheless provide a good basis for rides in the area (both leisure rides broken up into stages and training rides for more advanced cyclists).
You can download the GPX traces by clicking on the coloured lines for each circuit on the map above. There is considerable crossover in the tracks so zoom in for the different colours.