Z 200 PORT command successful. You now have the file which you must uncompress and untar. Ask your local superviser if you do not know how. You may change the name of the file by providing another name on the get command. If equal to - write on the screen.
Most files use the zip utility for exchange.
MacOS Most files are in binhex format. Use a shareware such as Stuff'it to unstuff. Some files are self uncompressible.