are you using outlook express?
try clicking tools/options/security and untick "do not allow attachments to be saved or opened that could be a virus"
only thing i could find on the symantec KB re/.xls attachments was click here
Samsung Galaxy S8 review
1995-2015: How technology has changed the world in 20 years
This 2D animation about monsters is illustrated in a Van Gogh painterly style
How to get WWDC 2017 tickets
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.