Please note that this command will open the default browser (or a new tab in it) for this URL:
cmd /c start http://example.com
To create a scheduled task without a command popup:
Create OpenUrl.vbs:
CreateObject("Wscript.Shell").Run "cmd /c start " & Wscript.Arguments.Item(0), 0, False
Then call it from the scheduled task with this command:
wscript.exe "C: \ Path \ To \ Script \ OpenUrl.vbs" http://example.com
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