with installation of QlikView Desktop application came extension example. You can find it using file finder, under default folder path C://Program Files/Qlikview/examples/extensions. Just double click on the qar file there and the extension will be placed under the path that you mentioned in the first post.
You have not need to create any extension folder by yourself.
Go to > C:\Program Files\QlikView\Examples\Extensions
Double Click > Extension Examples.qar
Now extension with all necessary components are installed.
Go to and check extension folder here > C:\Users\[your user name here]\AppData\Local\QlikTech\QlikView