[OS X TeX] simpdftex and spaces in filenames

[Enrico Franconi]

Hi,
if a have a tex file with a space in its name, then simpdftex fails.

simpdftex --mode dvips a\ b.tex
### This is /usr/texbin/simpdftex, Version 20070507
### /usr/texbin/simpdftex a b.tex
### This is /usr/texbin/simpdftex, Version 20070507
### /usr/texbin/dvips -R -Poutline  -o /tmp/altpdfsimpdftex. 
12129-1211534789/ab.ps ab.dvi
This is dvips(k) 5.96 Copyright 2005 Radical Eye Software (www.radicaleye.com 
)
/usr/texbin/dvips: ! DVI file can't be opened.
### FAILED to generate /tmp/altpdfsimpdftex.12129-1211534789/ab.ps ()

How can this be fixed? I tried to call it in various ways, but to no  
avail.
cheers
--e.