What is the difference between these two portalapps folders on the Server?

Hello,

On the Server there are two portalapps folder:

1. Under: C:\usr\sap\JXX\JC00\j2ee\cluster\server0\apps\sap.com\irj\servlet_jsp\irj\root\portalapps

2. Under: C:\usr\sap\JXX\JC00\j2ee\cluster\server0\apps\sap.com\irj\servlet_jsp\irj\root\WEB-INF\portal\portalapps

Can someone please explain me what is the difference between these two portalapps folders and under which case will I turn to which folder?