I don't to be honest, but my guesses would be:
An Alsatian reisling or gewurtraminer. The former is sweeter while the latter is spicier, but both tend to be sweeter than standard wines. A late harvest would indicate an even sweeter wine. None of these would really be dessert wines, but could certainly be served as such.
Could also be a muscat, although I'm not sure that this would be typical of France. 'Vin de glaciere' (ice wine) would be the proper name.
Sorry I don't know, but hopefully these will jog someone's memory.
-Andrew