strange character exporting to final draft

I’m trying to export a text in portuguese to final draft. the formating works really well, but, instead of accents, my text is full os strange characters. I think it has something to do with unicode. I tried to convert in TextEdit from UT8 to UT16, but when I opened it with Final Dralt the text was full of boxes instead of characters.

some idea to get it right?

tks

roberto