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A bit of info about the private folder on the root of the SD card, it needs more research though...
sdmc
sdmc
├── DCIM
├── DCIM
├── Nintendo 3DS
│ ├── <ID0>
│ │ └── <ID1>
│ │ ├── [[SD Savedata Backups|backups]]
│ │ ├── [[Title Database|dbs]]
│ │ ├── [[extdata]]
│ │ ├── [[Title Data Structure|title]]
│ │ └── [[DSiWare_Exports|Nintendo DSiWare]]
│ └── [[SD Filesystem#Private|Private]]
└── [[SD Filesystem#Other Private Data|private]]
└── Nintendo 3DS
└── app
* Everything stored under sdmc/Nintendo 3DS/<ID0>/<ID1> is encrypted with console-unique [[AES|keyslots]], files stored under [[Flash Filesystem|nand/data/<ID0>]] only use these keyslots for MACs. All CTR files under these directories use the keyslots initialized by [[nand/private/movable.sed]].
* Everything stored under sdmc/Nintendo 3DS/<ID0>/<ID1> is encrypted with console-unique [[AES|keyslots]], files stored under [[Flash Filesystem|nand/data/<ID0>]] only use these keyslots for MACs. All CTR files under these directories use the keyslots initialized by [[nand/private/movable.sed]].
When you want to install and see pictures with 3DS, rename to 8 numbers.mpo and save it on /DCIM.
When you want to install and see pictures with 3DS, rename to 8 numbers.mpo and save it on /DCIM.
Under the sound private dir is: voice/XX/*.m4a. Where XX is 01-10, with sound saved as .m4a.
Under the sound private dir is: voice/XX/*.m4a. Where XX is 01-10, with sound saved as .m4a.
== Other Private Data ==
There is also a directory called "private" on the root of the SD card that contains data, in which would otherwise be completely different from what the Nintendo 3DS normally uses, but known to the application itself.
Some apps, such as Flipnote Studio 3D create a directory called "private" on the root of the SD Card, it contains a Nintendo 3DS directory inside it. Inside the app directory contains a directory with the game code of the application (eg. "JKZP" for Flipnote Studio 3D), then its corresponding data, as shown here:
/private/Nintendo 3DS/app/<Game Code>/
In this case of Flipnote Studio 3D, there are multiple files with an ID, then ending with the .kwz extension. There is also a !!.lst file as well.