[PATCH 05/10] ntdll: Add LOCALE_CUSTOM_UI_DEFAULT support in RtlLcidToLocaleName.

[Piotr Caban]

From: Piotr Caban

---
 dlls/ntdll/locale.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/dlls/ntdll/locale.c b/dlls/ntdll/locale.c
index d8c30cafcb9..6199e7d0756 100644
--- a/dlls/ntdll/locale.c
+++ b/dlls/ntdll/locale.c
@@ -1065,7 +1065,9 @@ NTSTATUS WINAPI RtlLcidToLocaleName( LCID lcid, UNICODE_STRING *str, ULONG flags
         lcid = system_lcid;
         break;
     case LOCALE_CUSTOM_UI_DEFAULT:
-        return STATUS_UNSUCCESSFUL;
+        RtlRunOnceExecuteOnce( &mui_init_once, load_mui_settings, NULL, NULL );
+        lcid = mui_settings.user[0];
+        break;
     case LOCALE_CUSTOM_UNSPECIFIED:
         return STATUS_INVALID_PARAMETER_1;
     }