Convert MK3D to MKV3D

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MK3D and MKV3D are probably the very same file format just with different extension, so you can simply rename one to another should you need it. Dedicated Matroska programs like MKVtoolnix should be able to work with all kind of Matroska formats regardless of their actual file extension.

Open MK3D file    Open MKV3D file