How to use Chainsaw in principle
Let's assume that you have a file song.mp3 that you'd like to send per e-mail to your friend
Step 1: Split the large file

Step 2: Send the pieces
In our example you'd send one
for each piece. And don't forget to send the .bat file.
Step 3: Put the large file together again
Your friend does not need Chainsaw to restore the original file.

The original file is restored by the .bat file.