When is 3dmf not 3dmf?

[Carl Adler <carl at adler-software dot com>]

When I use
f = getopenfolderitem("3DMF")
Some apparently valid 3dmf files (I can view them in a 3dmf viewer) 
will be grayed out.
For Example this file (4boxesStream.3dmf) is in the examples downloaded 
> from realbasic
-----3DMetafile ( 1 6 Stream tableofcontents0> )
    Container (
        Box (
            0 0 1                           # orientation
            1 0 0                           # majorAxis
            0 1 0                           # minorAxis
            -0.5 -1 0                           # origin
        )
        Container (
            AttributeSet ( )
            DiffuseColor ( 0.9 0.0 0.0 )
        )
    )
    Translate ( 3 0 0 )
    Container (
        Box (
            0 0 1                           # orientation
            1 0 0                           # majorAxis
            0 1 0                           # minorAxis
            -0.5 -1 0                            # origin
        )
        Container (
            AttributeSet ( )
            DiffuseColor ( 0.0 0.9 0.0 )
        )
    )
    Translate ( 0 3 0 )
    Container (
        Box (
            0 0 1                           # orientation
            1 0 0                           # majorAxis
            0 1 0                           # minorAxis
            -0.5 -1 0                           # origin
        )

        Container (
            AttributeSet ( )
            DiffuseColor ( 0.0 0.0 0.9 )
        )
    )
    Translate ( -3 1 0 )
    Container (
        Box (
            0 0 1                           # orientation
            1 0 0                           # majorAxis
            0 1 0                           # minorAxis
            -0.5 -1 0                            # origin
        )
        Container (
            AttributeSet ( )
            DiffuseColor ( 0.9 0.9 0.9 )
        )
    )
--------
can not be opened.

Tux the penguin can be opened. It has a prolog of
----------
3DMetafile ( 1 6 Normal tableofcontents0> )
        trimesh0:
        Container (
                TriMesh (
                        192 1 0 0 108 2
                        # triangles
-----------
But another one with prolog
-----------
3DMetafile ( 1 6 Normal tableofcontents0> )
        trimesh0:
        Container (
                TriMesh (
                        2048 1 0 0 1089 1
                        # triangles
------------

is grayed out and can't be opened.

Carl

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