How do you change the default opening application?

[NoOp]

On 08/05/2009 09:59 AM, marc wrote:
> Chris Jones wrote:
> 
>> marc wrote:
>>> Changing the default app for an exisiting mime-type is simple, but
>>> how do you change the default app for "undefined" mime-types?
>>> 
>>> When I open a file in a file manager, I want it to open in
>>> the appropriate application -- and most of the time it does. When the
>>> file's mime-type does not have an associated app, I want to open the
>>> file with my application of choice. How do I change this application?
>>> 
>>> The problem I have at the moment is that, somehow, the .chm reader
>>> application that I have installed has become the "fall back"
>>> application, which is not a good thing.
>>
>> Try right clicking on a file and poke around in the properties. I 
>> believe in there somewhere you can change the default application 
>> associated to the file type.

Right click and select Properties|Open With|Add
You can then add the application if it's not already there. Select 'Use
Custom Command to put in the path of the app if it's not listed in your
applications.

> 
> Yup, I know how to do it for a mime-type, it's the undefined cases I
> need to fix. Thanks anyway.
> 

For adding new mime types, perhaps:

<http://www.google.com/search?complete=0&hl=en&q=ubuntu+%2B"mime-type"&btnG=Google+Search>
https://help.ubuntu.com/ (enter mime in the search box)
  https://help.ubuntu.com/community/AddingMimeTypes
will help?