Excel 2008 for OSX seems to be missing a UTF8 import
No matter which I choose I get garbage for diacritics
the file is showing fine in TextWrangler which reports it is in UTF-8
EASY solution for Mac Excel 2008: I struggled with this many times, but here was my easy fix:
Open the .csv file in Textwrangler which should open your UTF-8 chars correctly.
Now in the bottom status bar change the file format from "Unicode (UTF-8)" to "Western (ISO Latin 1)" and save the file.
Now go to your Mac Excel 2008 and select File > Import > Select csv > Find your file > in File origin select "Windows (ANSI)" and voila the UTF-8 chars are showing correctly.
Open the CSV in a text editor, such as Sublime or Text Wrangler. (Text Edit won't work.) Save the file with encoding