from maxconsole guide on istalling .cia files on the new gw3.0
Step 1: Put your .cia manager on the root of your Gateway Red SD Card. If yours came in .cia format, you need to go back and download it as .3ds for now. Put the card back in when you are done.
all my eshop games are .cia files sooo I take it i need them to be .3ds now to install and was wondering how to convert back