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Re:Finance Pros Say You’ll Have to Pry Excel Out of Their Co... by tmzt on Friday December 01, 2017 @11:21AM (#15824800)
Or you could:

   unzip *.xlsm
   git add .
Probably with some custom diff scripts for the xml files.
Re:Finance Pros Say You’ll Have to Pry Excel Out of Their Co... by Declanomous on Saturday December 02, 2017 @12:55PM (#15833063)
I did most of this in Access.

Also, I wasn't allowed to install version control of any sort, so that's really the bigger problem.