Custom icon for Show-BalloonTip

I’ve tried numerous online tools to convert our 256 x 256 png logo to an icon file. No matter what I try, it looks like crap compared to the PSADT default icons (info, stop and warn.) Has anyone had any luck with this?
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For comparison, here’s the PSADT info icon…
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NotifyIcon doesnt support custom balloontip icons unless you create your own drawing handler. The 4 options are all built-in microsoft ones.

Thank you for the reply. This is from the documentation for PSADT v3.8.0 -

" AppDeployToolkitLogo.ico - To brand the balloon notifications and UI window title bars with your own custom/corporate logo, replace the AppDeployToolkitLogo.ico file with your own .ico file (retaining the file name)"

Andy