The game should automatically create the required files in that folder. This is more about game config settings and does not include savegames. So there should be no need to copy things back.
Unless you have some Far Cry 4 Map Editor maps in there, copying those back will allow you to edit them again.
Hello!
As these steps were given out so long ago I don't have the full reasoning behind the suggestion, however I can offer some insight.
As Steve64b explained above, the steps given were to delete the corrupt files and allow the game to recreate them. Placing the items back into the folder could cause the issue to reappear.
If this does not work, try making sure you have checked for any anti-virus or overlay software that could be conflicting with the game!