>I am using smtpmail.prg to create and send emails with the attachments. The function works fine on my computer but in clients computer it comes with the following error : Class defination MSWINSOCK.WINSOCK is not found. Any help will be appreciated. TIA Shafid

See if this http://berezniker.com/content/pages/visual-foxpro/appropriate-license-class-not-found-error-runtime may be relevant.