Yes, there is a way to suppress this message programmatically. You can use VBA code to save the workbook as a macro-enabled file type (.xlsm) instead of a macro-free file type (.xlsx). Here's an example code:

This code will run automatically when the workbook is closed. It first turns off the display alerts to suppress the message, then saves the workbook as a macro-enabled file type, and finally turns the display alerts back on.

Alternatively, you can use Office 2007 policy to disable the message. Here's how:

1. Open the Group Policy Editor by typing "gpedit.msc" in the Run dialog box (press Windows key + R to open the Run dialog box).
2. Navigate to User Configuration Administrative Templates Microsoft Office Excel 2007 Excel Options Security.
3. Double-click "VBA Macro Notification Settings" to open the policy settings.
4. Select "Disable all VBA notifications" and click OK.
5. Close the Group Policy Editor.

This policy will disable all VBA notifications, including the message you're seeing. Note that this policy will affect all Excel workbooks, not just the one you're working on.