1. Open regedit and expand "HKEY_CLASSES_ROOT" key.
2. Now look for the file type which you want to remove from "New" menu, e.g. for removing MP3 file type look for .MP3 key.
3. Expand it and delete the "ShellNew" key.
4. Thats it. The file type will be removed from "New" menu.
http://www.askvg.com/how-to-add-remove-items-from- new-menu-in-windows/