Even better, would be Sandboxie's ability to prevent the contents from being opened or extracted.
Yes, the whole concept of Sandboxie is to isolate particular and possibly malicious programs but security would be hardened if these features could be implemented.
In other words, if one likes exploring the contents of the sandbox, and attempts to open or extract a program i.e. zip file contained within it, one could be exposing oneself to possible security issues.
A person needs to know as a rule, that they should not open or attempt to extract an isolated program outside of the sandbox unless they know it comes from a trusted source but I think "knowing" and "remembering" is not enough and reminders would be a great help and enhance the security provided by Sandboxie even more.
Thanks tzuk for a fantastic program
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