Prepar3D v4\Scenery:  APX,BRX,CVX,OBX

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Who can explain what each of these files is responsible for?

I know only about the file APX, NAV is stored there.

The file OBX I think he is responsible for the building?

The file BRX,CVX?

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Actually, APX is the airport container and navaids can be included with airports but you'll find most enroute navaids in the NVX container.  The CVX container is for things like ground polys and OBX are scenery objects.  Not sure about BRX.

See also FSDeveloper Forum at

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I wondered whether the BRX files were those "extrusion bridge" models. I have all of the APX, BRX, and OBX files removed in the UK and Ireland, because I wanted to remove all of the default models.

Edited by Christopher Low

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