Microsoft Excel mangles Diacritics in .csv files?

Question

I am programmatically exporting data (using PHP 5.2) into a .csv test file.
Example data: Numéro 1 (note the accented e). The data is utf-8 (

Answer 1

Excel 2007 properly reads UTF-8 with BOM (EF BB BF) encoded csv.

Excel 2003 (and maybe earlier) reads UTF-16LE with BOM (FF FE), but with TABs instead of commas or semicolons.