It will do more or less the same thing in good old dos script fashion
set add=%1
if %add%$ ==$ set add="about:blank" && goto launch
rem http://
set test=%add:~0, 7%
if %test% == http:// goto launch
rem ftp://
set test=%add:~0, 6%
if %test% == ftp:// goto launch
rem https://
set test=%add:~0, 8%
if %test% == https:// goto launch
rem add http
set add=http://%add%
:launch
start microsoft-edge:%add%