Setting mime type for excel document

Question

MS Excel has the following observed MIME types:

• application/vnd.ms-excel (official)
• application/msexcel
• appli

Answer 1

Waking up an old thread here I see, but I felt the urge to add the "new" .xlsx format.

According to http://filext.com/file-extension/XLSX the extension for .xlsx is application/vnd.openxmlformats-officedocument.spreadsheetml.sheet. It might be a good idea to include it when checking for mime types!