Given a WinRar archive file to open that said to use gunzip to extract and then use tar -xvf to extract [closed]

I was given a WinRar file from a client to unzip using the gunzip method followed by using the tar -xvf method but its a Jar file inside it. I was able to somewhat open it up to a Java jar file but when I go to run it, nothing happens. Likewise when I use the Ubuntu to gunzip it, Im getitng the following errors below.

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so as you can see from both images, it wont work. Why isnt it not doing what I want it to do?

I dont understand why its saying its a directory

Any help or steps to take would be helpful

I have tried unzip and extracting it and then trying to run the java file as executable and no luck