Download the kiwix app for whatever OS you’re using, then go into Kiwix and click on the folder icon in the app and navigate to where the .zim file you downloaded is located. If you click it it should automatically pop-up and be viewable.
If you did that and it’s still failing, is it giving you a specific error or anything?
RDP is kind of limited because it’s a virtual session. It’s useful if you only need to do stuff while you’re actively connected but you can’t, for example, remote in and start an app or process going and then disconnect and have that app continue. When you d/c your profile is essentially logged out. Your activity also can’t be viewed by a user on the remote system, if you needed to collaborate or assist somehow.
UltraVNC has worked ok for me for windows systems. It has some of that open-source clunk to the UI, but is pretty straight forward and does what I need.