Is this so hard to fix? Or important?

[C de-Avillez]

On Wed, 5 Jun 2013 16:44:05 +0800
Ma Xiaojun <damage3025 at gmail.com> wrote:

> warty-final-ubuntu.png is actually a JPEG file
> https://bugs.launchpad.net/ubuntu/+source/ubuntu-wallpapers/+bug/296538
> 

I thought in UNIX (and Linux, and similar) we did not depend on the
extension of a file name.
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