What would be the correct content type setting for microsoft file formats

e.g for png it's image/png

What would be the HTTPR开发者_开发技巧esponse content type for the following file formats (e.g. doc, docx, ppt, pptx, xls, xlsx and open office equivalents).

doc, docs - application/msword
ppt - application/vnd.ms-powerpoint
xls - application/vnd.ms-excel

For more see http://www.w3schools.com/media/media_mimeref.asp