I've created a new job description: Software Archaeologist
https://news.ycombinator.com/item?id=3532122for reasons too depressing to go into - i spent a large chunk of time running someone else's collection (deck?, tree? what's the collective noun for spreadsheets?) of spreadsheets. I got to the point that I could see the evolution from v1 to v10+ and it wasn't pretty.
Here's to all the software Indiana Joneses out there - my condolences.