You normally do not need to know this. ShellExecute(0,0,"http://stackoverflow.com",0,0,SW_SHOWNORMAL);
will do the trick. Windows will spot the http:// and figure out from there that you want to open a URL. The "default" webbrowser is pretty much defined as the webbrowser used by Windows for this task.
It's not just http:// which is supported. ShellExecute can start the default webbrowser with https:// URLs as well. For mailto: URLs, it starts the default mail client.
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