pdf-files in e-mail

When i will open a pdf-file in Opera 10 or Firefox , it is opened in GNU Image viwer.
a week ago it was a chose which program to use (among them kpdf)

How can I open it as pdf?

Gunnar Sylte

System settings - Advanced - File Association - Application
Select PDF in the list
Make sure the application you want to open it is at the top of the List (Application Preference Order)