x_t to 3ds conversion is almost certainly searched by users looking for a way to either import Parasolid files to 3ds Max, or to directly convert models between these two software platforms. You can find a commercial plugin for this on Autodesk website (ProtoTech's PARASOLID Importer), but this is probably meant for companies and not for users that want to just convert single file. It might be worth exploring various 3D converters or even using exchange format as middle step for the conversion.
Updated: March 8, 2023