> Hmmm, but shouldn't there be some way to just make a copy of the file, put in a container and tell the AI, scan the environment, do nothing except watch what the excel sheet does and record it, then determine how to create an identical sandbox containing the same outputs and feedback.

AI will attempt to evade your sandbox.

The only thing you can do is ask the AI to do a decompile and have it summarize, or better, do the summary yourself.