Outlook 16 sending payslips and invoices as win.dat also asking Allow or Deny
Using Reckon Accounts Premier 2018 and upgraded from Outlook 2007 as I thought that was the reason, to Outlook 2016. Both running as Administrator. Outlook 2016 settings to HTML etc. but no joy. When I check the messages sent in Sent Box they show as PDF but recipient has them in win.dat format. Contacted Outlook support who happily told me it was a Reckon error.