The contains the animation logic, UI rendering, and file I/O. On DSi, it accesses slot0:/ (internal NAND) and slot1:/ (SD card). On 3DS, these are redirected to the DSiWare save area.
What “Flipnote .CIA” means
After the massive success of the original on the DSi, the 3DS version took forever to launch in the West. For a while, the only way to get it was through specific reward programs, leaving a lot of animators in the dark. flipnote studio dsi cia