I have made two improvements to the ModelDef viewer in ModelConverterX lately.
The first one is that you can now search in the ModelDef file. At the top you find a toolbar with a text box for the search string and a previous and next button to search backwards or forward for the entered search string.
The second improvement is that you can now only show the part of the ModelDef file that is being used by your model. This is selected with the checkbox in the toolbar. If you select it (which is the default value now), only the animations and part info’s that are used in your model are shown. This will greatly reduce the list in many cases.