How can I access the \Application Data folder, the one inside \App Data.?
Just type the environment variable into the file explorer's navigation bar... %appdata% It'll take you to the roaming appdata folder. If you need the local appdata folder, go up a folder and enter local. Or use the %localappdata% environment variable.
change the Folder View options ie Unhide it, but make sure you re-hide it asap as its hidden for very good reasons.