The option File > Info > Protect Document > Encrypt with Password isn't supported when the document's label applies encryption. In this scenario, the encrypt with password option becomes unavailable for users.
This is an All Document Reader app. This app is designed for reading all documents on your phone. This application works as your office document reader and will allow you to view all documents and files on your phone.
So to answer your question: Yes, Git can be used to manage versions of word documents etc., furthermore using gitattributes you can even diff word documents although I'm not sure if this is possible for xls files.
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