Load external file (.3ds) during runtime

i would like to to instantiate an object during runtime.
The related file(.3ds) is stored in an externale file (NOT Ressource),
so i can add additional files after building the project.

Is there any way to do this WITHOUT AssetBundels (can’t use UnityPro).

Thank you in advance

No, The Unity runtime doesn’t have any asset importing features included. The only things you can load dynamically at runtime are those image formats: png or jpg and this audio format: Ogg Vorbis. However you can write your own importer if you know the file format. You could also invent your own “asset bundle” format (maybe xml based or something like that). Unity doesn’t provide any other way to load assets at runtime besides assetbundles.