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The ideal solution to this problem (and many others) would be using text based, human readable file formats.

Like the XML-based formats that MS Office has used as its default for saving documents since 2007?

Isn't it zipped? Can Git really handle .docs? Would be great!

That doesn't sound ideal, that sounds subpar but easier. A human readable text based PPT sounds atrocious!

This doesn't mean that people have to edit in text editors.

Anyway, having non-proprietary file formats is more important than being human readable. For this reason and others.