Well, I hadn't noticed this myself. In the previous Ubuntu version, you were able to specify as a command an application you wanted to open a specific file-type with in the
Properties > Open With window, but now that doesn't seem possible. You might as well file a bug report for this - it is a very important function that got lost.
I can think of a couple of workarounds though.
1. Desktop file approach
This is one "hacker" way of doing it. In order to start, you must first find out the mimetype name of the SWF file:
Right-click the file and open
Properties and stay in the
Basic tab. Look for the line that says Type and write down somewhere the last part of that line that is between parenthesis. It should be named something like
application/swf-flash or something in that fashion.
Now you must create (unless it already exists, in which case you would edit) a
*.desktop file in one of the working
applications directories mentioned below:
and in the
MimeType field include the mimetype you found in the previous step. To do this, simply create new line and write the following:
if you are editing an existing desktop file, append the mimetype you found and a semicolon to the line:
This is a working desktop file that I have come up with while you read:
Name=Flash Player Debuger
Remember to change
application/swf-flash for the working mimetype!
Once completed this step, the application you created a
*.desktop file for should appear in within the other applications in the
Open With tab in the
Properties window of any SWF file.
2. Assogiate application
I don't know if this method still works, but I remember an application called
assogiate which would let you change all the file associations made by the system among other things. You might want to install this, its in the Software Center.