Split and Join - Version 3.0.0 Split and Join is the fastest utility that enables you to split large files into pieces small enough to transport on floppy disk. Select the file and the destination folder, then enter the size of each piece in bytes to do the deed. A number of popular split sizes are readily available to choose from. In addition to splitting the file, Split and Join also creates a small batch (bat) file you can use to reassemble the pieces. It splits very big files and every file type.