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Tools | Macro | Security
If it is set to High, then no code will run and no warning will be given.
Set it to Medium to get notified that code exists and to be given the option
of allowing it to execute or not.
I do not recommend going to the LOW security setting.

Also, after making a change to the security setting, you have to close Excel
and reopen it to have the change take effect.

"Finance guy" wrote:

I have a workbook that when opened by double clicking as an outlook attachment,
the workbook_Open event does not execute.