To change the file type of the attachment click the Link Preferences button to set up links. Check the Convert attachment to specified file type box and then select the appropriate file type from the pull down list.
U S I N G T H E W I N D O W S ® - B A S E D B R O T H E R S M A R T U I C O N T R O L C E N T E R ( F O R W I N D O W S ® X P ) 16 - 12