Split & Concat... Large files are often split into smaller pieces in Internet newsgroups because messages cannot exceed a certain size to be posted in newsgroups.
You will often find binary files that have been split into parts such as filename.mp3.001 or filename.mp3.002, and filename.mp3.003, etc. Although it is possible to combine these parts using commands in Terminal, not everyone is skilled enough. This is why I created a small utility that works with OS X. It allows people to easily split large files and upload them. Or, to combine files from the Internet. This program can also be used to recombine large files, e.g. to be placed on one CD.