KMimeType::mainExtension()

[Nikolaj Hald Nielsen]

> One of the things we can do when we have a Bamboo CI server running is
> check the build against KDE 4.2 and have it report failures.

I think this will be a Very Good Thing as we devs have a tendency to
always use the shiniest new toys and often forget to think about how
things work on slightly older versions, which just happens to be what
many, if not most, users are running.

- Nikolaj