Re:Windows 11 will respect default browser for system apps i...
by heftig on Wednesday August 30, 2023 @11:24AM
(#37323611)
To enforce the use of Edge, they're using URLs with the "microsoft-edge" scheme.
Some time ago Microsoft made it impossible to reassign this scheme to another app like EdgeDeflector.
PS: It was KB5007262 that "addresses an issue that might improperly redirect OS functionality when you invoke microsoft-edge: links."
So if you want to make your random executable be "a browser", my guess is you should register it as a handler for http, https, and .html, at least.