emacsW32 can't find gunzip

[Xah Lee]

when using emacsW32, in dired, i press Z to uncompress a file, but i
got this error:

apply: Searching for program: no such file or directory, gunzip

any idea how to fix that?

I have cygwin installed. “which gunzip” shows “/usr/bin/gunzip”.
Manually gunning gunzip or gzip -d with shell-command works fine.

GNU Emacs 23.0.94.1 (i386-mingw-nt6.0.6002) of 2009-05-28 on
LENNART-69DE564 (patched)

  Xah
∑ http://xahlee.org/

☄