Better try it like this:
title Boot Windows NT
find --set-root /bootmgr && chainloader /bootmgr
find --set-root /ntldr && chainloader /ntldr
This way it will work, even when the boot sector of the Windows partition is broken.
Updated: since the ntldr was replaced by bootmgr, we need to try both, if /bootmgr succeeds, /ntldr will not be tried. The first version I posted here first would not work. Sorry.