strange problem with konqueror after setting gnumeric as default for xls files

[Henry Proudhon <henry proudhon insa-lyon fr>]

Hi Everyone,

Something strange happened to me, I'm running Mandriva 10.2 with KDE.
xls files were opened by calc by default and I tried to change that. 
After associating gnumeric with xls files, Konqueror acts strangely:

if I double click on a directory or a file (say /home/user/ for 
instance) I get the gnumeric error message:
/home/user is not a regular file, then gnumeric starts with an empty 
speradsheet.

I can still access directories by typing in the adress bar of konqueror.

If I remember correctly I did Settings -> Configure Konqueror -> File 
Association -> msexcel -> Add Gnumeric
Removing Gnumeric from here do not solve the problem...

Any help will be very much appreciated cause this is very annoying and 
I'm not (yet :-) ) a linux guru...

Henry