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.rar. It's really a national security matter, but back in 1974, a high density titanium alloy memory storage device was "procured" by the NSA. Aftar about a decade of scans and tests, they managed to extract about 2MBs worth of binary data. Five more years of reverse engineering by the top computer scientist team in the United States led to the extraction of a Win32 compatible executable. Upon running this program, it immediately identified the original binary data as what is currently known as a "RAR-archive", containing the program itself.
This time, the egg really came before the chicken.