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DFONT (data fork font) is a macOS-specific font format that stores TrueType font data in the data fork of a file, rather than the resource fork that classic Mac OS used. It was Apple's transitional solution when Mac OS X moved away from the resource fork architecture that classic Mac fonts depended on.
Inside, a .dfont file contains the same TrueType tables you'd find in a .ttf file — glyf, cmap, head, hhea, hmtx, and friends — but wrapped in a resource-fork-style container structure stored in the data fork. Multiple font faces can live in a single .dfont file, which is how macOS bundles font families. The system fonts that ship with macOS (Helvetica Neue, Geneva, Monaco, etc.) were historically distributed as .dfont files.
DFONT is a Mac-only format. Windows and Linux can't use .dfont files without conversion, and even on macOS the format is gradually being replaced by .ttc (TrueType Collection) and .otf files. If you need cross-platform compatibility, convert to TTF or OTF using FontForge or a similar tool.