Convert mv4 to sxw

What is the difference between .mv4 and .sxw?

Description: M4V is a video container that stores audio and video data used for iTunes files. Files of this type may be protected from illegal viewing and copying with Apple FairPlay DRM. In this case audio or video files should be bought in iTunes store. Not protected files can be viewed almost in any modern player because the format is based on MPEG-4 structure.; The SXW file format is associated with StarOffice Writer, a word processing application that was part of the StarOffice suite developed by Sun Microsystems. The SXW file type was primarily used to save text documents that could include formatted text, images, tables, and other document elements. StarOffice served as a precursor to the more widely known OpenOffice.org suite, which later evolved into Apache OpenOffice and LibreOffice, among others.