bug#13272: 24.3.50; `diff' output header line shows MS Windows root incorrectly

[Eli Zaretskii]

> From: "Drew Adams" <drew.adams@oracle.com>
> Date: Mon, 24 Dec 2012 14:07:05 -0800
> 
> I'm seeing this now in the very first line of my `M-x diff' output:
>  
> diff -c c\:/foo/simple.el c\:/foo/simple-patched-2012-12-24.el

That's your diff.exe at work, I'm quite sure: it tries to quote the
colon, because it's a Cygwin Diff and lives in the Unix world.  Don't
you see the same if you redirect Diff output to a file?

The version of Diff I have does this instead:

  diff -c "c:/foo/simple.el" "c:/foo/simple-patched-2012-12-24.el"

which is much more reasonable.