Notes about the AOL file extension:
To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened
" (Windows 7) or "How do you want to open this file?
" (Windows 10) if you double-click the file. There click on "More apps"
and choose a suitable software to view such files on your PC or from email attachments.
The AOL file type is primarily associated with 'AOL' by America Online, Inc.. If the file keeps popping up as ??.PAYMENT.AOL or ??.PAYMENT.AOL.COM then it's part of Shopping Assistant. Turn it off: Settings, Preferences, WWW, Shopping Assistant tab.