thunar insist on gnumeric

[Mihamina Rakotomandimby]

Hi all,
I have an Xubuntu 11.04 (Natty) and when double clicking on a 
spreadsheet file, it tries to launch gnumeric.
But I have removed gnumeric from the system and now use LibreOffice calc.

I looked into the settings wizard and
   'mihamina at dfdc:~/.config$ grep -r 'gnumeric''
But did not find:

Where is that setup?

Thank you.

-- 
RMA.