Merged fix from svn/trunk to handlng of file type of nested files within a .osgx, .osgt and .osgb file.


git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/branches/OpenSceneGraph-3.2@14345 16af8721-9629-0410-8352-f15c8da7e697