The .d file extension is most commonly used for program files that have been written in the D programming language. The D programming language is similar to the C++ programing language, but combines C++ with the power of other modern programming languages like Python and Ruby. By utilizing a D compiler, users can compile the D files into an executable computer application.
The .d file extension is also used for ChemDraw chemical modeler output files, Dialect source code files, GBG DraftMaker drawing files, SPPACK files and Linux files.
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If you have additional information about the D file format or software that uses files with the D suffix, please do get in touch - we would love hearing from you.