Our servers do not have an extractor installed so you wouldn't be usually able to extract a file directly on the server, however one of our clients has found a solution this issue, here is what he wrote for your use:
Ever wondered how to copy many files to your website?
Here is an easy way to do it:
-Create a ZIP folder in your webspace so you can reach it on the web, like http://yourwebspace.com/zip
-Extract this this zip file
in there (it contains 5 files and an image directory with 14 images)
-You can reach the new page by the following URL: http://yourwebspace.com/zip/extract.php
-Compress all the files you want to upload to your webspace in a ZIP file.
-Upload this file with your favorite FTP program to your webspace.
-Go to the extract.php page.
-Follow the screens and enter the right path for the ZIP file and the destination directory.
-Press the Extract button.
Now all of your compressed files are uncompressed in the given destination directory. You only have to upload one file instead of hundreds.