At main window after bringing up OE 6 goto Tools on top bar

select Accounts

then select Mail TAB then select account ( example i selected mail ) you can double click

then select Servers TAB

everything should be like below except Account name

select ok

then close

then go back to Tools

this time select options

select Security TAB

the option we are looking for is the lower Checked box Do Not Allow Attachments to be saved.

uncheck option and select ok

close oe

restart OE

hope this helps