Optimal Archive lets you view the structure of your zip-file in the explorer tree - launch applications from inside the zip file, and drag and drop files from and to the zip file with ease and it is free.

You can compress zip files and uncompress zip, rar, arj and tar files with Optimal Archive.

Optimal Archive viewer lets you color code the background of each file format for easy differentiation.

Another useful feature allows you to create self-extracting, multi-volume files for easy transport via emails or diskettes.

Optimal Desktop eliminates clutter on your desktop, lets you access files, folders, zip files, web pages from the same window using tabs.