Abort Workbook open if workbook is read only.

I've got several workbooks that users will be using to keep track of individual projects. These workbooks will talk back to a master summary sheet that has the status of all projects on it. The possibility exists that someone else on the network will have the summary book open when the program tries to update it, which would cause an error when it opens as read only. So I want to do something like this.

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