It is often said that xlsx and docx files are basically zipped folders of XML files and assets, I wonder how effective it would be to add the decompressed forms to git to see and track changes (or similarly for git to show diffs for the files inside a tar/zip
Not hard at all as it turns out. I had to do this a few years back to extract PBI metadata (metric names, queries, data sources, etc.) from of our dashboards.