ediff-problem when starting emacs from another program

[Arne Christian Hårseth]

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Please write in English, because the Emacs maintainers do not have
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In GNU Emacs 21.2.1 (i386-msvc-nt5.0.2195)
 of 2002-03-19 on buffy
configured using `configure --with-msvc (12.00)'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: NOR
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

I start up emacs from WinCVS and run ediff to compare two buffers. Emacs
then gives the following error message:

c:\Programfiler\GNU\WinCvs 1.2\diff.exe: missing operand
c:\Programfiler\GNU\WinCvs 1.2\diff.exe: Try `c:\Programfiler\GNU\WinCvs
1.2\diff.exe --help' for more information.

If I open the same files from a stand alone emacs it works just fine.

This occures with ntemacs 20.7 and 21.2.
I run WinCVS and emacs on W2K.

Recent input:
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1> <mouse-1>
<mouse-1> <mouse-1> <mouse-1> q <backspace> <menu-bar>
<buffer> "s.html" <help-echo> <down-mouse-1> <mouse-movement>
<mouse-1> <menu-bar> <buffer> "s.html<2>" <down-mouse-1>
<mouse-movement> <mouse-movement> <mouse-movement>
<mouse-movement> <mouse-movement> <mouse-movement>
<mouse-movement> <mouse-movement> <mouse-movement>
<mouse-movement> <mouse-movement> <mouse-movement>
<mouse-movement> <mouse-1> <menu-bar> <tools> <compare>
<ediff-buffers> <return> <return> M-x <help-echo> <help-echo>
r e p o r t - e m a c <tab> <return>

Recent messages:
Composing main Info directory...
Mark set
Composing main Info directory...done
Mark saved where search started [2 times]
GNU Emacs 21.2.1 (i386-msvc-nt5.0.2195) of 2002-03-19 on buffy
mouse-minibuffer-check: Minibuffer window is not active [2 times]
GNU Emacs 21.2.1 (i386-msvc-nt5.0.2195) of 2002-03-19 on buffy
Loading emacsbug...done
Computing differences between s.html175626l and s.html1756DFs ...

ediff-prepare-error-list: Errors in diff output. Diff output is in #<buffer
*ediff-diff<2>*>