Swapnote
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Swapnote, aka Nintendo Letter Box in EUR, is an eShop application which allows you to send notes to friends via SpotPass/StreetPass.
Swapnote Extdata
Every note written and received besides the built-in notes are stored in Extdata. There's two extdata files per note, these are created when new notes are saved. Properly recovering cleartext via XOR for the *whole* note data is difficult, since these extdata files would already have the note data stored. The starting filename for extdata notes seems to be 00000007?