What is a ddd file and how do I open a ddd file?
DDD is a data file used by GLBasic, an application used to develop cross platform software with the BASIC programming language. DDD files save the vertices of a 3D object and can be rendered as part of a 3D animation or as a static object in a GLBasic program.
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How to open ddd file on Wikipedia
How to open ddd file on Microsoft.com