I can open a browser under a different user using "runas" inside the shortcut target like this:
runas.exe /user:username /savecred pathtobrowserexe
However, I would like this to be the default for this user, not only when opening Chrome with that special shortcut, so in case the user clicks on a link in an email for instance, it should also run the browser under different user credentials (the same user as above). Is there any way to do this? I tried hacking the registry (HKCU\Software\Classes\https\open\command) but nothing seems to work.