I'd be sane to treat these containers like directories. Directories are just another kind of container. Given a tarball baz.tgz in /foo/bar containing the files a and b/c you'd tell the user about matches in the paths /foo/bar/baz.tgz/a and /foo/bar/baz.tgz/b/c. I think Windows "Compressed Folders" work like this.
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