Setting up portable application as default email client? (re mailto)

[StargateFan2]

It was easier to work with earlier versions of Windows for this issue; just can't figure it out this time around.I use a portable email sniffer program, predominantly, to send/receive mail.In the past, it was easy to add it as the default email program esp. with regards to "mailto" which I have various scripts I need to start using again.But the issue is that since the portable is not installed, it doesn't show up under the default mailto protocol screen in settings.I've wasted over an hour trying to find an answer to this but no go (even registry editing, etc.)Can someone kindly help, please?

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