From Clare of Mon Vélo Et Moi: 

“Earlier in the year I bough a French book from Chamina publishers which plots the route from Tours to Namur along the, as yet unrealised with signs, Eurovelo 3.  The directions in the book weren’t great when I did Namur to Paris at Easter but the general overview from Orleans to Paris is as follows:

1. Canal d’Orleans to Montargis (via Combreux and Donnery) (85km)
2. Valley of the Loing from Montargis to Veneux-les-Sablons (via Nemours et Dordives) (55km)
3. Valley of the Seine from V-l-S to Choisy-le-Roi (via Corbeil-Essonnes and Melun) (85km)
4. Follow the Seine into Paris. (29km)

Not sure if that is of any help.  It is the plan for the EV3 and I saw some signs at Easter although not enough to rely on. Enjoy Orleans and enjoy the cycle.”