HTML format (.htm or .html): text/html 

Adobe Portable Document (pdf): application/pdf 

Microsoft Word (.doc): application/msword 

Microsoft Excel (.xls): application/msexcel 

Microsoft Powerpoint (.ppt): application/ms-powerpoint 

Realaudio (.rm, .ram): audio/x-pn-realaudio 

Text format (.txt): text/txt 

Zipped files (.zip): application/zip