Just some extra information regarding file formats.
.tar files are compressed files similar to .zip files. The difference is that .zip files use a commercial format for which a licensing fee is payable when software is distributed commercially. The .tar files are essentially free to use.
z7 is a compression/decompression software program that deals with several different types of compressed files including .zip and .tar formatted files. It is essentially free to use having originated in the Linux community.
So this is really all about avoiding having to pay extra money to software companies for use of their products. It might only amount to a penny a file, but with millions of files in use every day, it soon mounts up.
