Register mailto Protocol to custom program on windows 10

I would like to register my program to handle the MAILTO protocol

i have seen these answers

i tried adding a new key or modifying the existing key at this path HKEY_CURRENT_USERSoftwareMicrosoftWindowsShellAssociationsURLAssociationsMAILTOUserchoice

additionally, i added my program to to the HKCR root, but that did not make my program appear in the select list

also, for testing purposes, i tried replacing the classname value of the mailto key at this path HKEY_CURRENT_USERSOFTWAREClientsStartMenuInteetGoogleChromeCapabilities URLAssociations to the classname of my program. this actually worked. but instead of hacking into google chrome, id rather add my own registry key

how can i add my program as a legit handler for mailto

TIA

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