We're about to go to France, Belgium and Netherlands on our own. My AAA office didn't know if a US handicapped placard would work there. I contacted the automobile associations of those countries. Here were the responses:
--The Belgian response was "Knowing that the logo signaling an handicaped person is exactly the same as in Europe, you only need to highlight it under your windshield to fully enjoy the avantages and places marked out for handicaped persons."
--The Dutch response told me how to apply for a placard recognized by all EU countries. I sent (by regular air mail) a copy of the drivers license, the passport photo page, and a photocopy of the placard my state issued to:
To mr. C. Susana
P.O. Box 3012
2280 GA Rijswijk ZH
About a month later I received a placard!
The cover letter and a brochure was all in Dutch, so I did some Google translating to learn that the different countries do have slightly different regulations about whether this placard entitles us to ignore parking time limits, but that's OK, we'll just try to read the signs and plan to obey them.
--No response from the French