There are some executables included with the sdk that enable previewing of GPL (geometry), ACT (hierarchy), ANM (animation), SKN (skinning information) and TPL (texture) files. However, it seems that these require some sort of PowerPC configuration through either the dolphin development hardware or an old powerpc mac. There is a previewer.exe in the sdk, but I haven’t been able to get it to load a gpl without crashing so far.
Honestly my best chance will probably be emulating an old build of Mac OS X (e.g. 10.5 Leopard) and trying to load the preview scripts on that platform.