These files are referenced internally in some places, but there’s no documentation. Are they meant to be internal use only and not be usable to users?
.textureset is the old extension which was replaced by .tilesource
.texture and .mesh are internal types
.cgh I actually have no idea what it is 
Where did you find the references?
There is a CGH/CG Editor defined too, but it opens a normal text editor.
You can see .CGH file mentioned in Preferences->General->File Associations
I can’t remember at the moment where I saw those other types, it might have been in the same place and they were removed. I did a LOT of poking of the internals of the editor while working on the book trying to find anything that would be useful to know that isn’t documented… although it didn’t really produce much useful info for the book I appreciate the work it takes to add new features to this version of the editor.
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Right, the CGH is most likely a CG shader header file. We replaced the support for CG with GLSL a long time ago, it’s just a remnant.
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Great, thank you for info!
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Are .cubemap files function at all?
Yes, we made a shiny 3d car demo with them. I can’t post a pic because the art wasn’t ours, but it looked a lot like this: http://threejs.org/examples/#webgl_materials_cars
Cube maps are really poorly integrated in Editor1 though and require a bit of gfx fiddling to use, they work better in Editor2 where you get to see them mapped to a 3d sphere etc.
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