Paul's method should work.
Basically, from my experience, whatever database (and computer) you connect to keeps the .xml file. The one from which you connect loses it.
It is rather easy to recreate the file. If, as Steven says, you simply go to the folder on the main computer and open Amazing Utilities, you can click on the Repair Connections at the bottom. When you click on this, it will open up a window. You browse to the AC folder, click on it, and then hit OK. It will quickly repair the connection by creating the file with the correct path.
For those who do not wish to make their own or for those whose helpful IT guy just can't get the job done, you can download an AmazingCharts.xml file from this link:
http://tinyurl.com/amazing-xmlKeep in mind if your path is not C:\Program Files\Amazing Charts then you will have to change that by opening it in notepad. But, that path is the default path.