The ODB++ data exchange format is used for printed circuit boards, assembly and test data. It is widely accepted as an alternative for Gerber by many PCB manufactors.
The file format is structured in the directory tree. This tree will often be compressed in a single file by common compressing tools like zip. For using it with the LayoutEditor the directory tree and each entry file must be uncompressed. To open it choose the matrix file in the matrix sub folder of the main tree. This file is mandatory for all ODB++ data bases.