Oh, just a note:
Since we're all looking for different versions of the same file, please download this utility and write MD5 checksums for every version that you find.
So far I've found one version of 1.8, one version of 1.92, two versions of 1.95, three versions of 1.97, and one version of 2.01a. I know I have other copies of DOS/4GW, but they are integrated with the program executable, so I can't give them to you. (That said, those are more than likely duplicates of versions I already have separately.)
Something I found rather interesting: NO Sierra games use the DOS/4GW extender. This is probably because all their games have independent parsers (AGI or SCI), but even LEC's VGA SCUMM parser used DOS/4GW!