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Excel offers 2 layers of password protection. The first is to stop viewing anything. The second is to prevent editing of the document, but it allows viewing.
You should be able to password-protect it, so that it can be viewed but not edited. That should stop people adding malicious code to your work of art.
Also, if you are having trouble sending it (some email pages won't accept .xls or .xlsx files), then change the suffix to something like .ymt, or something that has no file associations. You would just need to specify to the receiver, to change the suffix back to the original form.
This is how I send them across skype.
EDIT: You could also export it as a PDF, and password protect that. That way, it is essentially an eBook.
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