I use both Fileviewer and Shape Viewer without any trouble. Do remember however that with built-in items and others that use the combined texture file rather than separate texture.txt and tga files, neither program will load the texture. Another program is Jetview which will allow you to load and view animations. However you can only escape from it by closing it or using Windows button - D to minimise all windows. It does have one advantage however in that, as it uses the Auran Jet engine, it gives a better impression of what you will see in Trainz, which is useful when one runs into Alpha channel or animation problems.