On a Mac, an application is actually a folder, but OS X pretends it's a single item. If you find the viewer under Applications in the Finder desktop, then Ctrl-click (or right-click) on the icon and get the menu, one of the menu choices is "Show Package Contents". If you do that, OS X will show you the actual folder the app represents. Then you can follow Sara's instructions for where it is... In that folder there is a Contents folder, then Resources, then the gpu_table.txt file is in there. It needs an update, which Sara has attached to her message as a zip file.
Edit: Looks like others beat me to it on this info and you have found the menu.