I apologize if there's another thread for this, but I have searched on this forum and found no post that explicitly states what program I must use to run my .nud and .nut files on and what plugin I must use to convert them to have them usable in other 3D programs like Autodesk. A friend has found the files of .nud and .nut Pauline model in Sm4sh and I am looking for a proper way to have them usable on my desired program. 

If anyone can help me, thank you in advance.