Convert PT3 to DFONT

PostScript Type 3 (PT3) is a file format developed by Adobe Systems in the 1980s for font files in PostScript language. Unlike the more common PostScript Type 1 format, PT3 allows for the inclusion of complex graphics and color. However, it is less widely used due to its lack of support for hinting, which affects the clarity of text at small sizes. PT3 was largely replaced by Type 1 fonts and later OpenType formats. It served as an important step in the evolution of digital typography, allowing greater flexibility and creativity in font design.

The DFONT file extension stands for "Data Fork Font", a format used in Mac OS X (now macOS). Introduced to replace the older resource fork-based TrueType fonts, DFONT consolidates all font data into the data fork, enhancing compatibility with the OS X file system. Historically, DFONT was employed for system fonts like Courier and Helvetica, but it has been largely superseded by TrueType (TTF) and OpenType (OTF) formats. DFONT files are specific to macOS and cannot be used on Windows or Linux systems.