I know, but I mean, in Serpent 52 (not in New Moon 28), did you get a "What should do Serpent do with this file?" dialog box, or nothing happened? All what I did to have this happening, was: File --> Open File, locate the sample mp4 file, and it gave me the "What should do Serpent do with this file?" dialog box. The same happened when I dragged and dropped the file to Serpent.