new verison released. You can find at bottom of post #1.
Fixed problem with Bones treeview checkboxes
App can now handle GR2 files with multiple models
Re-coded the exporter info section
Finished the ArtToolInfo:ExtendedData names
Added DiffuseColor0 to known names
Still isn't able to open all GR2 files. Still working out the bugs
Still haven't coded the textures or materials yet.