After you install Microsoft Office 2003 Service Pack 3 (SP3), you cannot open Microsoft Excel 5.0/95 Workbook
files that contain Microsoft Visual Basic for Applications (VBA) macros in Microsoft Office Excel 2003
macro security level is set to High
or to Very
, you may receive the following error message:
This workbook cannot be opened under High Security Level
because it contains a type of macro (Microsoft Excel 4.0 macro) that cannot be
disabled or signed.
If the macro security level is set to
, you may unexpectedly be prompted to enable the macros or to disable
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Microsoft has increased the level of security for VBA macros
in Microsoft Excel 5.0/95 Workbook
files in Office 2003 SP3.
This change provides more control for you to determine which macros will run. Additionally, this change helps prevent security attacks on earlier