diff not working in Cream install on Windows XP 64-bit

I get an E97 every time I try a diff, even after setting diffexpr to
be empty. I've checked that I can create temporary files with a
writefile([strftime("%c")],tempname()).

So, this doesn't seem to be caused by tmp file access, a bad diffexpr,
or any of the other usual suspects. See the following cmd.exe session,
in a directory made by a fresh gvim 7.3.289 install (latest "Vim
without Cream"):

C:\>cd "Program Files (x86)\vim\vim73"

C:\Program Files (x86)\vim\vim73>dir *.exe
Volume in drive C is Local Disk
Volume Serial Number is EA9A-15F2

Directory of C:\Program Files (x86)\vim\vim73

07/28/1999 08:15 PM 73,728 diff.exe
08/29/2011 12:24 PM 2,667,008 gvim.exe
10/04/2011 04:06 PM 45,910 uninstall.exe
08/29/2011 12:25 PM 2,494,464 vim.exe
08/29/2011 12:24 PM 8,192 vimrun.exe
08/29/2011 12:24 PM 15,872 xxd.exe
6 File(s) 5,305,174 bytes
0 Dir(s) 206,321,045,504 bytes free

C:\Program Files (x86)\vim\vim73>.\diff.exe --version

C:\Program Files (x86)\vim\vim73>echo %errorlevel%
-1073741819

C:\Program Files (x86)\vim\vim73>

Has anyone had success using the diff.exe included in the standard
Cream install, on Windows XP 64-bit?

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