How to extract a Jar file ?

Just go to the path where the jar file is located in command prompt,

1)go to start
2)type cmd
3)type d: if the jar is in d : or c:pathName1\pathName2\Folder Name
4)Just type jar xvf fileName.jar

and your class file is generated
 

Difference between .zip file and .tz file ?

.zip  ----------> Supports Windows setup
.tz    ----------> Supports unix setup