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

For anyone who is still stumbling with this after using all of the possible MIME types listed in the question:

I have found that iMacs tend to also throw a MIME type of "text/xls" for XLS Excel files, hope this helps.