OpenRaster
From Just Solve the File Format Problem
OpenRaster is a file format for layered raster images. It is designed to be an open alternative to Photoshop's PSD format, and similar formats used by graphics editors. It uses ZIP as a container format.
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Identification
One of the files in the ZIP container is named "mimetype", and its contents are the ASCII string "image/openraster". Ideally, that's the first file in the container, and it's stored without compression.
