> Pretty much the only 16-bit software that people commonly encounter is an old setup program.
I know quite a lot of people who are still quite fond of some old 16-bit Windows games which - for this "bitness reason" - don't work on modern 64 bit versions of Windows anymore. People who grew up with these Windows versions are quite nostalgic about applications/games from "their" time, and still use/play them (similar to how C64/Amiga/Atari fans are about "their" system).
I know quite a lot of people who are still quite fond of some old 16-bit Windows games which - for this "bitness reason" - don't work on modern 64 bit versions of Windows anymore. People who grew up with these Windows versions are quite nostalgic about applications/games from "their" time, and still use/play them (similar to how C64/Amiga/Atari fans are about "their" system).