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The "deep" explanation of how this was achieved can be found on Russ Cox's research site, research!rsc .

: Be careful when opening such files in automated scripts or certain unzipping tools, as recursive archives can sometimes trigger "zip bomb" protections or cause infinite loops if the software tries to extract every nested layer. Zip Files All The Way Down - research!rsc Download 102k zip

: Cox walks through the byte-level construction, including how to handle the checksums (CRCs) that would normally change when the file's content changes. The "deep" explanation of how this was achieved

: This is a "quine" zip file—a recursive archive that contains a copy of itself. When you open r.zip , it contains another file also named r.zip , which contains another r.zip , and so on, theoretically forever. The Deep Blog Post : This is a "quine" zip file—a recursive