Changes

                                     /title.db

                                     /title.db

"'''title.db'''" - The "title.db" file (among other things perhaps), archives data about titles installed on the SD Card which includes their [[Serials#Product Code|Product Code]], number of NCCH and NCCH types, Title size and Title Version(the title version determines the name of the .cmd file which contains data from the title TMD used for anti-tampering purposes). This data is taken from the title's [[SD Filesystem#title|TMD]] and [[NCCH#CXI|executable NCCH]] during install, this is also party why the encrypted TMD found in each title directory is redundant, as the important information is moved to the ".db" and ".cmd" files during title installation. Since this file controls what SD Card titles are accessible to the 3DS, it is possible to move between different versions of an SD Card title if you have the title.db and title data for each version of that specific title.

"'''title.db'''" - The "title.db" file (among other things perhaps), archives data about titles installed on the SD Card which includes their [[Serials#Product Code|Product Code]], number of NCCH and NCCH types(to determine if a 'Manual' option should be availible for the title), Title size and Title Version(the title version determines the name of the .cmd file which contains data from the title TMD used for anti-tampering purposes). This data is taken from the title's [[SD Filesystem#title|TMD]] and [[NCCH#CXI|executable NCCH]] during install, this is also party why the encrypted TMD found in each title directory is redundant, as the important information is moved to the ".db" and ".cmd" files during title installation. Since this file controls what SD Card titles are accessible to the 3DS, it is possible to move between different versions of an SD Card title if you have the title.db and title data for each version of that specific title.

"'''import.db'''" - The function of the file is not well understood. It appears to be related to the download/install of titles, as in the progress of downloading titles this file will have changed but the title.db will not be modified until the title has been properly downloaded. This file doesn't contain any title specific data which the 3DS has been noted to use in relation to titles on the SD Card, even though this file is modified when titles are installed/deleted. Infact, no matter what titles you install, if you use an old copy of the "import.db" with a recent copy of the "title.db", this creates no noticeable issues.

"'''import.db'''" - The function of the file is not well understood. It appears to be related to the download/install of titles, as in the progress of downloading titles this file will have changed but the title.db will not be modified until the title has been properly downloaded. This file doesn't contain any title specific data which the 3DS has been noted to use in relation to titles on the SD Card, even though this file is modified when titles are installed/deleted. Infact, no matter what titles you install, if you use an old copy of the "import.db" with a recent copy of the "title.db", this creates no noticeable issues.

"'''XXXXXXXX.app'''" - (There is no pattern to the file name) These files are [[NCCH]] files, where the entire file is encrypted with a per-console key. There can be more than one NCCH in this directory, as seen with .[[CCI]] files, the game executable ([[CXI]]) can be accompanied with additionally non-executable NCCH files ([[NCCH#CFA|CFA]]) such as the game manual and DLP Child containers. Determining the function of the encrypted NCCH, is done by finding the Content Index of the "XXXXXXXX.app" file in the title's TMD(see above for retrieving decrypted TMD), interpreting the Content Index is as follows:

"'''XXXXXXXX.app'''" - (There is no pattern to the file name) These files are [[NCCH]] files, where the entire file is encrypted with a per-console key. There can be more than one NCCH in this directory, as seen with .[[CCI]] files, the game executable ([[CXI]]) can be accompanied with additional non-executable NCCH files ([[NCCH#CFA|CFA]]) such as the game manual and DLP Child containers. Determining the function of the encrypted NCCH, is done by finding the Content Index of the "XXXXXXXX.app" file in the title's TMD(see above for retrieving decrypted TMD), interpreting the Content Index is as follows:

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