MapData Folder

Can anybody tell me what is the MapData folder which has recently appeared on my D drive? (This is the drive containing all my user folders with the exception of Pictures.)
It contains subfolders diskcache, mapscache and files overrides.json, updater.nma

I suspect this may have something to do with the offline storage of Map data. Refer to your system settings:

Thank you,
Yes, it looks like you are correct.
I never store maps for offline use however, so I presume I can simply delete this folder.
I bet it gets recreated within a few minutes though!