mkextunpack(8) on macOS
The text 7fb9a9d3bbe7, as Mac OS X 10.2.8.G5, Mac OS X 10.2.8, Mac OS X 10.2.7, Mac OS X 10.2.6, Mac OS X 10.2.5, Mac OS X 10.2.4 shipped it.
extracts the contents of a multikext (mkext) archive
The text 7fb9a9d3bbe7, as Mac OS X 10.2.8.G5, Mac OS X 10.2.8, Mac OS X 10.2.7, Mac OS X 10.2.6, Mac OS X 10.2.5, Mac OS X 10.2.4 shipped it.
extracts the contents of a multikext (mkext) archive