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How do I add file associations into the Thunderbird-Preferences-Attachments-Incoming list?

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Using MacBook Pro with OS X 10.9, and Thunderbird 31.0. I am clicking on a "DWG" file that is attached to an incoming email, and it should automatically open in progeCAD Viewer DWG, as I have made that association in Finder. (I previously saved the file, and opened it in progeCAD.) But when clicking on the attached file in Thunderbird, it keeps asking me if I want to save the file, instead of opening it in the App mentioned above. I went to Thunderbird-Preferences-Attachments-Incoming and see a list of associations. I want to add this "DWG" association, but can't see how to add it to the list. Can anyone help me? Or tell me why this isn't working? Thanks in advance.

Using MacBook Pro with OS X 10.9, and Thunderbird 31.0. I am clicking on a "DWG" file that is attached to an incoming email, and it should automatically open in progeCAD Viewer DWG, as I have made that association in Finder. (I previously saved the file, and opened it in progeCAD.) But when clicking on the attached file in Thunderbird, it keeps asking me if I want to save the file, instead of opening it in the App mentioned above. I went to Thunderbird-Preferences-Attachments-Incoming and see a list of associations. I want to add this "DWG" association, but can't see how to add it to the list. Can anyone help me? Or tell me why this isn't working? Thanks in advance.

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your offered an option to save the file or select an application to open it with. Select the application and choose the remember option.

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No option to select an application to open it with. That would be what I would have expected, but it is not offered. Just an option on whether or not I want to save it.