Why is it important to be able to write programs that convert files from one format into another format?
This is usually caused by following an outdated diff or history link to a page that has been deleted.
If this is not the case, you may have found a bug in the software. Please report this to an administrator, making note of the URL. We learn to break up a large problem into several smaller ones which are more easily solved. In this case we also study file formats which may be useful in other circumstances later in life. The particular task is not important in itself but in creating a solution for this task we will learn how to solve problems that have never been solved before.