Source code written in the D programming language; similar to C++, but also influenced by C#, Java, and Eiffel; can be opened and edited in a text editor, but requires a D compiler to be compiled into an executable program.
The D file extension is related to ChemDraw, a scientific program for chemistry analysis and simulation for Windows. A *.d file is one of the output files used by the program
The D file extension is associated with the programming language Dialect. An interpreted programming language with GUI, networking, and object oriented capabilities.