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| The following is a list of known file formats used by the 3DS.
| | #REDIRECT [[:Category:File_formats]] |
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| === Applications ( any executable code ) ===
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| .CCI - Cart image. Burned into a ROM (or loaded by official debugging hardware). These are also the actual format of ROM dumps, and the response of read requests between a 3DS and a cartridge. See [[CCI]].
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| .CXI - Executable image. Similar to above. The difference is CXI applications are installed onto [thus ran from] NAND. See http://3dbrew.org/wiki/CXI.
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| .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.
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| .CSU - System Update. Format varies slightly with revisions.
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| .CFA - Externalized ROM-FS. CXI data and ROMFS data can be separated into a list of external files instead of compiled into just 1 CXI image. (Normally not used.)
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| .NSA - Archive used by several of the communication protocols in the 3DS.
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| .RSF - Descriptive data used when outputting a CCI/CXI file. Specifies options such as: title, save type, and so on.
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| .AXF - Pre-assembled ARM code. before being linked into a CCI/CXI format.
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| === Filesystem ===
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| The 3DS filesystem requires absolute paths. It can handle either short (8.3) and long (255 char maximum) file names.
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| == MPO (Multi-Picture Object Format) ==
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| Document describing the file format used in mpo files:
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| http://www.cipa.jp/english/hyoujunka/kikaku/pdf/DC-007_E.pdf
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| [[MPO|Nintendo's MPO Specifications]]
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