Excel has failed to open the protected workbook MS office 2007

I have made an application using XLS Padlock with hardware protection, it is working smoothly in MS OFFICE 2016, but showing an error ‘excel has failed to open the protected workbook…’ when one of my clients tried to open it in MS OFFICE 2007.

Have you tried your original workbook source file in Office 2007 before compiling with XLS Padlock? Some Office compatibility problems are known with old 2007 version.

Yes! I have checked it in 2007, the file is working smoothly, only the compiled file is not opening in MS OFFICE 2007.

This is the error I am getting.

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Please clear all formula protection to see if there is one formula not handled in Office 2007.