Finder information is a set of data structures containing Macintosh-specific metadata about a file or folder, including the presentation of its icon.
Certain details about the data structures have evolved over the years, so any given source of information about them might be incomplete.
Information about a file is contained in two 16-bytes structures, named FInfo and FXInfo. Information about a folder is contained in two 16-bytes structures, named DInfo and DXInfo.
The first 8 bytes of FInfo contain the Macintosh type/creator codes.
- Inside Macintosh - Macintosh Toolbox Essentials → "Finder Interface Reference" section starting on p. 7-46
- An HTML version (from archive.org)
- In some SDKs, the structures are defined in a file named Finder.h (example: )