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How do I change which application is the (default) for a given file type?

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For .pdf files, I have set the application behaviour to "Always Ask", because sometimes I want to open the pdf, sometimes I want to save it. So far so good.

Now, when I want to open the .pdf, I have added an application to the dropdown list, so now I have "Adobe Reader 9 (default)" and "okular". The problem is this: I *never* open using Adobe Reader. I always want to use okular, but Adobe Reader always appears first on the list, as it is the 'default'. This means I always have to click on the dropdown and select "okular", i.e. an extra step every time I want to open a pdf.

How do I change which application is the default?

For .pdf files, I have set the application behaviour to "Always Ask", because sometimes I want to open the pdf, sometimes I want to save it. So far so good. Now, when I want to open the .pdf, I have added an application to the dropdown list, so now I have "Adobe Reader 9 (default)" and "okular". The problem is this: I *never* open using Adobe Reader. I always want to use okular, but Adobe Reader always appears first on the list, as it is the 'default'. This means I always have to click on the dropdown and select "okular", i.e. an extra step every time I want to open a pdf. How do I change which application is the default?

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Yes, I know that. That was the first sentence of my question, but it is not the problem I have. I want to change which application is the (default) for a given file type, and this cannot be done from the settings.