GM Viewer not recognising some gm files

[Hrv123]

GM viewer cant recognise/show/open etc number of GM files.

...Age of Pirates 2\RESOURCE\MODELS
big_sky.gm
sky.gm
small_sky.gm
sphere.gm

It opens/show normally ships/animals/items/islands etc .gm files.

Do I need some other tool to see/open/convert those 4 .gm to .obj?

 

[SuperChango]

Sometimes it does that, TOOL does too, if you try to open the default MoW by example...
and btw, you don't want to convert to OBJ, the best export way is to .wrl (VRML) with TOOL