Changes

.CXI - Executable image. Similar to above. The difference is CXI applications are installed onto [thus ran from] NAND. See http://3dbrew.org/wiki/CXI.

.CXI - Executable image. Similar to above. The difference is CXI applications are installed onto [thus ran from] NAND. See http://3dbrew.org/wiki/CXI.

.CIA - Importable/installable application. An application ran from NAND after being loaded from an external [not NAND] source. The CIA format allows the CXI image to be imported/installed properly.

.CIA - (CTR Importable Archive) It is the application compiled into an archive, ready to be installed to a designated location. A .CIA file can be extracted to install applications to the, CTR NAND, TWL NAND (part of the NAND used by DSi applications), and the SD card.  

.CSU - System Update. Format varies slightly with revisions.

.CSU - System Update. Format varies slightly with revisions.