If you would like to export the OFT file to make a mailing from the Outlook email client on MacOs, you should use the EMLTPL file export.
Because OFT files are meant for MS Windows only. And currently, they can't be used on Mac OS.
Select the "Download EMLTPL file" option to download your email template in the EMLTPL format that is meant precisely for macOS.
This way you can open the email template in the Outlook on MacOs.
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