PNG Plus
From Just Solve the File Format Problem
PNG Plus or Portable Network Graphics Plus (.png+) is a valid PNG thumbnail file with a Microsoft Compound File sandwiched in between. PNG Plus replaced the native MIX used in Microsoft Picture It! and later Digital Image software.[1]
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File Information
PNG Plus format is used to store layers, pages, and other edits.[2] Opening outside of Microsoft Picture It! and Digital Image software will only render a thumbnail.
Format Information
PNG Plus files have a OLE container near the end of a PNG file, but before the IEND chunk.
