I'm sorry I haven't the time to help everyone with their commandline troubles. You need to extract the file o4xr.zip
before you can do anything with the files.
Here is some info for learning more about how to use the Linux commandline.
BashGuide - Greg's Wiki
BashGuide/CommandsAndArguments - Greg's Wiki
List of Bash online-tutorials [Bash Hackers Wiki]
"Pirates are people who attack ships. People who share software are good neighbors." - Richard Stallman