From the GNU Coding Standards:
If you do support Windows, please do not abbreviate it as “win”. In hacker terminology, calling something a “win” is a form of praise. You’re free to praise Microsoft Windows on your own if you want, but please don’t do this in GNU packages. Instead of abbreviating “Windows” to “un” [sic], you can write it in full or abbreviate it to “woe” or “w”.
On another note, I need to stop suffixing all of my post titles with “Of The Day.”