3DXML file stores data in XML format (short for Extensible Markup Language). 3DXML format is used for storing structured data of 3D objects. The format is proprietary to Dassalt Systemes, however the format specification is available to the public under open-source license.

3DXML format was created to meet the requirements for easier texture, lighting effects, and other 3D object integration with web applications and technical documents.