Agreed, installing the entire Cygwin compatibility layer for dos2unix/unix2dos would be overkill. I have found that when searching for Windows compiled versions of some common *nix utility, GnuWin32 often saves the day. In this case, they have a native compiled conv, u2d, and d2u (aka convert line endings, unix2dos, and dos2unix):

http://gnuwin32.sourceforge.net/packages/cygutils.htm

A quick Google of perl unix2dos also came up with this handy link for additional Perl scripts:

http://technocage.com/~caskey/dos2unix/