Since it hasn't been mentioned, and for completeness (planetscape's methods would be my recommendation for automated solutions):

1. load file into vi
2. in command mode: %s/^V^M//g 
(^V is literal mode, then add carriage return, or ^M)
3. save file.

[download]
This might work with vim if you use vi compatibility mode; vim -C iirc. Otherwise vim tends to ignore eol differences.

Update: Windows is not absolutely bound to crlf eols either. Load a Unix file into wordpad sometime. That's the classic unix eol test in Win32: looks funny in notepad, looks fine in wordpad.

In reply to Re: crlf to \n by dwm042
in thread crlf to \n by rgb96

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