Error while finding the _Entree d'agenda in French version

I am trying to insert some design elements in the calendar entry form which is named as "_Entree d’agenda " in French 8.0.1 install.However, we found that the following API is failing and returning ITEM_NOT_FOUND for the same.

NIFFindDesignNote(hMailFile, "_Entree d’agenda ", NOTE_CLASS_FORM,

&FormNoteID)

Could you please provide us some pointers on the above issue?