docs: Analyze NLS format differences between Wine locale.c and ReactOS XP/2003 infrastructure

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dll/win32/kernelbase/wine/locale.c targets the Windows Vista+ (NT 6.0) NLS architecture. ReactOS currently implements the XP/2003 (NT 5.x) NLS architecture. The two are incompatible at the file format, section type numbering, and API level — making init_locale() non-functional on ReactOS today.

Analysis written to media/doc/nls_format_analysis.md

NtGetNlsSectionPtr type numbering conflict

The type numbers used by Wine bear no relation to ReactOS's basesrv/nls.c mapping:

Type	ReactOS	Vista+ / Wine
1–8	Legacy files (unicode.nls, locale.nls, …)	STATUS_INVALID_PARAMETER_1 — these types don't exist in Vista+
9	STATUS_NOT_IMPLEMENTED	sortdefault.nls — called unconditionally at startup
10	STATUS_NOT_IMPLEMENTED	casemap table (l_intl.nls format)
11	codepage files	codepage files ✅ match
12	geo.nls	normalization NLS files — direct conflict

Missing/stub APIs in ntdll

• RtlGetLocaleFileMappingAddress — not exported at all; load_locale_nls() calls it unconditionally
• NtGetNlsSectionPtr — marked -stub -version=0x600+
• RtlNormalizeString — marked -stub -version=0x600+
• NtInitializeNlsFiles — marked -stub -version=0x600+

NLS file format mismatches

• locale.nls: ReactOS has the old 2003 binary format (no 'NSDS' magic). Wine expects NLS_LOCALE_HEADER + NLS_LOCALE_DATA[] (Vista+ format), which also embeds geo data. Geo data must move out of the separate geo.nls.
• sortdefault.nls: Does not exist in ReactOS. The old sortkey.nls + sorttbls.nls pair is superseded by a single unified file containing sort weights, casemap, ctypes, sort GUIDs, expansions, compressions, and jamo tables.
• Normalization NLS files: Absent entirely. NtGetNlsSectionPtr(12, NormalizationC/D/KC/KD, …) finds no files, and type 12 is already occupied by geo.nls.

Codepage NLS files (c_*.nls) — mostly resolved

txt2nls already generates the correct header format with proper TransDefaultChar/TransUniDefaultChar. The old create_nls.c always wrote '?' for those fields and is now obsolete. Two static files (c_856.nls, c_878.nls) still lack .txt sources.

NDK type gap

NLS_LOCALE_HEADER and NLS_LOCALE_DATA are only defined in Wine's sdk/include/wine/winternl.h. They need to be added to the ReactOS NDK headers before RtlGetLocaleFileMappingAddress can be implemented natively.