thunderbird file associations, where to set ?

[korgull]

Hi,

I have a problem finding how to get a pdf file to open with thunderbird 
without actually saving it to disk first.

This used to work find before my fedora core 6 upgrade but since this upgrade 
acroread stopped working. I basically don't need acroread so like to open the 
attachments with another helper in thunderbird.
Thunderbird displays an error when I try to open a pdf, and says "change the 
association in your preferences". Unfortunately there no such thing in the 
thunderbird preferences.

I expect the file association doesn't need to be set in thunderbird but 
thunderbird also doesn't use my KDE settings either.

Does anyone know where I can set the file association ?

regards,
Marcel