Making a Macro "autoopen"

[Joshocom]

Hello,

I have the following macro, which lets me set the zoom level for a document to 75%:

Sub View75percent()
'
' View75percent Macro
'
'
ActiveWindow.ActivePane.View.Zoom.Percentage = 75
End Sub

My question is: how can I edit this to make it an "autoopen" macro, so that it will automatically open all existing documents to this zoom level?

Many thanks,
Josh Mandel