hexl-mode on Win2k hangs

[Alex Brown]

I can't use hexl-mode on my Win2k machine.  It just hangs emacs.  Has anyone
else seen this?  hexl.exe works fine from the command-line.  hexl-mode uses
shell-command-on-region to run hexl.exe, is there a limit on how big the
region can be when this function is called?

I've got GNU Emacs 20.7.1.

Thanks a lot,
Alex