NACP

Roughly equivalent to non-gfx areas of 3DS SMDH. All strings for language-entries are UTF-8, unlike SMDH which uses UTF-16.

Total size is 0x4000-bytes.

Structure

Offset	Size	Description
0x0	0x3000 (0x300*16)	Language entries
0x3000	0x24	Zeros?
0x3024	0x4	?
0x3028	0x4	?
0x302C	0x4	?
0x3030	0x4	?
0x3034	0x4	?
0x3038	0x8	Application titleID
0x3040	0x20	?
0x3060	0x10	Application version string, encoding unknown.
0x3070	0x8	Base titleID for DLC, set even when DLC is not used. Usually app_titleID+0x1000?
0x3078	0x8	Application titleID
0x3080	0x4	?
0x3084	0x4	?
0x3088	0x4	?
0x308C	0x1C	Zeros?
0x30A8	0x8	Product Code (this field is sometimes zeroes, unknown why)
0x30B0	0x8	Application titleID
0x30B8	0x38 (0x8*0x7)	Array of application titleIDs, normally the same as the above app-titleIDs. Only set for game-updates?
0x30F0	0x4	?
0x30F4	0x4	?
0x30F8	0x8	Application titleID. Only set for game-updates?
0x3100	0x40	BCAT passphrase, all-zero when unused.
0x3140	0xEC0	Normally all-zero?

Language Entry

Total size is 0x300-bytes.

Offset	Size	Description
0x0	0x200	Application name string
0x200	0x100	Application developer string

Entry index for each language:

Entry-index	Icon language filename
0	"AmericanEnglish"
1	"BritishEnglish"
2	"Japanese"
3	"French"
4	"German"
5	"LatinAmericanSpanish"
6	"Spanish"
7	"Italian"
8	"Dutch"
9	"CanadianFrench"
10	"Portuguese"
11	"Russian"
12	"Korean"
13	"Taiwanese"
14	"Chinese"

Official apps tend to have the language entries' strings set to only English. Some apps don't have certain language entries set at all. In addition, official apps usually (?) don't have the following language entries set: Korean, Taiwanese, and Chinese.