The File Splitter is a free Windows program that will split any file into pieces of any size and later combine the pieces to form the original file. Many email systems place a limit on the size of an email message. Split the file into pieces smaller than the limit and email the individual pieces. These files can be combined later to form the original file. Files up to about 9 billion gigabytes can be split. A .exe file is produced to combine the pieces. The file to split can be dragged-and-dropped from Windows Explorer.