Conversion of 3ds files to mdl file format

There is probably no direct way how .3ds files could be converted as .mdl, i.e. direct 3ds to mdl conversion. However, you can export .3ds to .smd or .dmx from within 3ds Max, which can then be compiled along with a .qc with studiomdl to form the .mdl and related files.

Open 3DS file    Open MDL file