It customizes the cardgames.dll file so you can add your own decks and backgrounds.
This is a huge achivement. These decks are added in a manner that is totally MS.
It does NOT overwrite your existing decks and backgrounds.
Nothing to it. Just choose some images and thats it. The actual cardsheet is created using the original sheets, so it still looks great.
Since this only mods the card games, there is no risk of destroying your install.
Redid the UI and fixed some bugs. New bugs may have been introduced with the new UI.