javashrdlu.zip is the University of Missouri-Rolla student resurrection of SHRDLU, the graphical 3-D version (supplied by Greg Sharp; described on Terry Winograd's page and on the semaphorecorp resurrection page). It is a Windows distribution that bundles a Sun Java 1.2 JRE, Java 3D, and GNU CLISP running the SHRDLU MacLisp source, launched by shrdlu.bat.
It is preserved here as a Release asset rather than in the source tree because it is ~21 MB of third-party binaries (a Sun JRE and clisp) and is not appropriate to commit to, or serve from, a static-site repository.
The authentic Winograd source is preserved in the repo at source/original/. A clean modern Common Lisp port is at https://github.com/penlu/shrdlu ; the original ITS form is at https://github.com/PDP-10/its/tree/master/src/shrdlu .