Comment 12 for bug 292504

And here's the script itself (public domain, by qaaq on Ubuntu Brainstorm). It doesn't seem to work on most icons.

I changed the install instructions a little to re-use the built-in MIME type:

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sudo apt-get install sharutils icoutils
sudo cp gnome-exe-thumbnailer /usr/local/bin
sudo chmod a+rx /usr/local/bin/gnome-exe-thumbnailer
gconftool-2 --set /desktop/gnome/thumbnailers/application@x-ms-dos-executable/command --type string "/usr/local/bin/gnome-exe-thumbnailer %i %o"
gconftool-2 --set /desktop/gnome/thumbnailers/application@x-ms-dos-executable/enable --type boolean true
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