Register-ScheduledJob for Win 2008 R2

Hi

I am trying to setup a task using PowerShell on my Win 2008 R2 server using this command (I have the v3 powershell installed);

# Add a job option
$JobOption = New-ScheduledJobOption
 
# Add a trigger
$Time = New-JobTrigger -AtLogOn
 
# Register the job
Register-ScheduledJob -Name "Reboot 1" -Trigger $Time -FilePath "C:\Users\setup\Desktop\Script.bat" -ScheduledJobOption $JobOption

And get this error;

Register-ScheduledJob : Only Windows PowerShell script files are allowed for FilePath parameter. Specify a file with .ps1 extension.

Any idea how I can use a bat file?? I cannot figure it out, searched on web but no joy :(