Launch UIBuilder. From the file menu, choose open and find your way to the UI folder. Inside that folder, open the eq2ui.xml file. Once UIBuild loads the UI, you will have two windows. In the right window is a bunch of tabs across the top. Select the MainHud tab. Once that's selected, go to the window on the left. Find MainHud(should be highlighted) and expand it. It is inside there that you will find the file you are looking for.
One more thing. The window may be invisible. If so, there's a button further down on the left side, right above the properties window. It looks like an eye. Click on it to make the window visible(only if you can't see it to begin with).
Hope that helps.
