Any change could have unintended consequences. But that said, why not remove the password? Microsoft forums have prior discussions and writes how at:
https://social.technet.microsoft.com/Forums/office/en-US/b8e38c76-6b69-4e6b-ad06-448497161e23/password-removal-excel-2010 (same procedure for Excel 2013)
If someone has applied a few security levels on an Exel 2013 file...would it be possible to revert that file to its original state...without interfering with the integrety of the data within that file? something such reinitialise, in a Browser.
txs

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