This is a fraudulent email from someone trying to get you to open the attached file. Once that file is opened you can be infected with any number of virus or malware. The address it was sent from is one of the Yahoo chat group members out of the US that has been hacked it would appear.
Delete and ignore !
'51 SQ4, '37 VH500 Red Hunter, '56 SQ4 (basket case), '49 Sq4 (basket case), '48 A7 BSA Twin, too many other BSA's, Norton's, Triumph's, Ducati's and Japanese to list. Just crazed is all my problem is.