Binary file xlsb versus standard xlsx

I am evaluating XLSPADLOCK tool for Excel 2007/2010/2013.
I would like to know if, from a security stand point, it’s really much better to generate the .EXE file from a binary Excel file (xlsb).

If , by any reason, the xlspadlock protection is cracked , is it better to have started from a binary file or it’s the same?
Of course , the original Excel file must be protected with all Excel standard options.

Second question is: Is there any limitation/restriction in xlspadlock for the binary Excel files or it’s the same whatever is the Excel extensión?

I would appreciate a fast answer.

There is no restriction if you use a binary Excel file. However, it doesn’t give you more security.