3D Studio project MIME Type
MIME type details for model/x-prj
In active use| MIME type | model/x-prj |
|---|---|
| Extensions | .prj |
| First standardized | Unknown; 3D Studio DOS era |
| Created by | Autodesk |
| Browser support | Requires a compatible viewer |
| Example applications | Autodesk 3ds Max for 3D Studio projects, ArcGIS for GIS projection files |
| Poly support | Partial. 3D features apply to supported 3D Studio project content, not every file sharing the suffix. |
| Indexed by Poly | Yes. Filename search, plus visual similarity when supported geometry is processed. |
| Preview in Poly | Partial. Interactive preview when a supported model with visible geometry is available. |
| Poly agent | Partial. An optimized rendition of the 3D object or scene is provided to the agent, allowing compact yet information-rich multimodal interaction with 3D files. An available visual rendition is required. |
What does model/x-prj identify?
model/x-prj is Poly's identifier for the supported 3D Studio project meaning of .prj. It is not a general media type for every project file. This is a Poly-recognized identifier, not a claim of IANA registration.
A .prj file can be a 3D Studio DOS project. Autodesk documents importing these projects into 3ds Max, including choices for combining their objects and handling shapes.1 The suffix is also used for unrelated project and coordinate-system files.
In GIS, a shapefile's .prj companion records its coordinate system. It does not contain the shapefile's feature geometry.2 Identify the producing application before choosing an opener; a projection definition is not a 3D Studio scene.
Opening the file
For a 3D Studio project, use 3ds Max's Import command and its 3D Studio project option. Review how the application handles the incoming shapes.1 For a GIS projection file, open the associated dataset in its GIS application instead.
Poly support
Poly does not infer the 3D Studio meaning from .prj alone. A supported project identified as model/x-prj can receive 3D features. Those features do not apply to unrelated project files or turn a coordinate-system definition into a visible model.
For a supported model, orbit, pan, and zoom let you inspect its shape. Search by filename, or by visual similarity when visual content is available. Available geometry and scene counts appear in 3D Details.
An optimized rendition of the 3D object or scene is provided to the agent, allowing compact yet information-rich multimodal interaction with 3D files. Ask about visible shape or compare models; use the original application for precise authoring work.
Background and alternatives
The 3D Studio meaning comes from the DOS-era project format. It is related to 3DS, but a project can carry information beyond a mesh export.1
For sharing geometry from an old project, export OBJ or glTF from a compatible application. Keep the project when shapes and authoring details matter. Relabelling the original is not conversion.
Footnotes
- Autodesk. Importing PRJ files. ↩ ↩2 ↩3
- Esri. Shapefile file extensions. ↩