[h-e-w] tex-shell problems with emacs on XP

[Charles M. Goldie]

I'm having problems with tex-shell in a new installation of GNUEmacs 21.3.1 
on a Windows XP system.  The TeX version is MiKTeX 2.4.

When emacs is visiting an existing TeX file the tex-shell command (C-c C-f) 
works fine.  If the file is, for instance, a.tex then C-c C-f causes a 
window *tex-shell* to appear and the command

tex "\nonstopmode\input" a.tex

to be run in it.  But if the TeX file doesn't already exist, i.e. I get 
emacs to create the file a.tex and then type something into it, then C-c 
C-f results in the command line

tex "\nonstopmode\input" a.tex.tex

which of course results in an error.  This happens also if in a cmd.exe 
window I type

runemacs a.tex

in a directory where a.tex doesn't exist.

I can't reproduce this error on a Unix terminal, so think it may be special 
to the Windows version of Emacs.  Is it a known problem and would anyone 
have a correction?

My other problems are brought on by calling emacs from a 4nt command 
window.  Does anyone have experience of running emacs under the 4nt shell 
from JPSoft?

Charles.