browse-url-default-windows-browser does not work any longer. I am unsure
when it stopped working, but on at least Windows XP the attached patch
seems necessary. Could we please apply this as soon as possible so it
will get tested?



In GNU Emacs 23.1.50.1 (i386-mingw-nt5.1.2600)
 of 2009-10-15
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4) --no-opt --cflags
-Ic:/g/include -fno-crossjumping'