Convert MRW to 3DF

RAW digital photo formats typically cannot be converted between vendor specific formats, which is also the case of mrw to 3df conversion. At best, you can export your raw to some generic format like DGN (digital negative) with Photoshop Lighroom or similar software. But conversion or export between these two files seems unlikely.

Simply put, it is impossible to convert MRW to 3DF directly.
Thus, there is no so-called mrw to 3df converter or a free online .mrw to .3df converter to be found.