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FWIW, I wrote a small paper on this general topic a few years ago, collecting earlier work and own ideas.

"Files as Directories: Some Thoughts on Accessing Structured Data within Files"

i think we have some similar thoughts - i am working on a file format that accomplishes something like this

Says "get access" with a "locked" icon.

Is this paper freely available somewhere?

Thanks! Sorry - I didn't realize that the paper in the ACM DL is not open-access.