It's possibly worth noting that merely changing the filetype fileformat (ff) in Vim won't repair
a file which has a mix of *nix and dos line-endings, and because of the
still massive userbase of a few specific Microsoft tools (that are brain-dead on
this score), such files are rather commonly encountered. In such a case one has
to actively do something, and if one wants to do something inside Vim, it ought
to work to do what dwm042 wrote in reply above.