diff --git a/dlls/ntdll/actctx.c b/dlls/ntdll/actctx.c
index f8dd3fc3c68..4dc0c9878df 100644
--- a/dlls/ntdll/actctx.c
+++ b/dlls/ntdll/actctx.c
@@ -4891,6 +4891,24 @@ static NTSTATUS find_guid(ACTIVATION_CONTEXT* actctx, ULONG section_kind,
     return STATUS_SUCCESS;
 }
 
+static const WCHAR *find_app_settings( ACTIVATION_CONTEXT *actctx, const WCHAR *settings )
+{
+    unsigned int i, j;
+
+    for (i = 0; i < actctx->num_assemblies; i++)
+    {
+        struct assembly *assembly = &actctx->assemblies[i];
+        for (j = 0; j < assembly->entities.num; j++)
+        {
+            struct entity *entity = &assembly->entities.base[j];
+            if (entity->kind == ACTIVATION_CONTEXT_SECTION_APPLICATION_SETTINGS &&
+                !strcmpW( entity->u.settings.name, settings ))
+                return entity->u.settings.value;
+        }
+    }
+    return NULL;
+}
+
 /* initialize the activation context for the current process */
 void actctx_init(void)
 {
@@ -5524,3 +5542,38 @@ NTSTATUS WINAPI RtlFindActivationContextSectionGuid( ULONG flags, const GUID *ex
 
     return status;
 }
+
+
+/***********************************************************************
+ *		RtlQueryActivationContextApplicationSettings (NTDLL.@)
+ */
+NTSTATUS WINAPI RtlQueryActivationContextApplicationSettings( DWORD flags, HANDLE handle, const WCHAR *ns,
+                                                              const WCHAR *settings, WCHAR *buffer,
+                                                              SIZE_T size, SIZE_T *written )
+{
+    static const WCHAR namespaceW[] = {'h','t','t','p',':','/','/','s','c','h','e','m','a','s','.','m','i','c','r','o','s','o','f','t','.','c','o','m','/','S','M','I','/','2','0',0};
+    ACTIVATION_CONTEXT *actctx = check_actctx( handle );
+    const WCHAR *res;
+
+    if (flags)
+    {
+        WARN( "unknown flags %08x\n", flags );
+        return STATUS_INVALID_PARAMETER;
+    }
+
+    if (ns && strncmpW( ns, namespaceW, strlenW(namespaceW) ))
+    {
+        WARN( "unknown namespace %s\n", debugstr_w(ns) );
+        return STATUS_INVALID_PARAMETER;
+    }
+
+    if (!handle) handle = process_actctx;
+    if (!(actctx = check_actctx( handle ))) return STATUS_INVALID_PARAMETER;
+
+    if (!(res = find_app_settings( actctx, settings ))) return STATUS_SXS_KEY_NOT_FOUND;
+
+    if (written) *written = strlenW(res) + 1;
+    if (size < strlenW(res)) return STATUS_BUFFER_TOO_SMALL;
+    strcpyW( buffer, res );
+    return STATUS_SUCCESS;
+}
diff --git a/dlls/ntdll/ntdll.spec b/dlls/ntdll/ntdll.spec
index 04e108c4f0b..010793245b3 100644
--- a/dlls/ntdll/ntdll.spec
+++ b/dlls/ntdll/ntdll.spec
@@ -803,6 +803,7 @@
 @ stub RtlPropertySetNameToGuid
 @ stub RtlProtectHeap
 @ stdcall RtlPushFrame(ptr)
+@ stdcall RtlQueryActivationContextApplicationSettings(long ptr wstr wstr ptr long ptr)
 @ stdcall RtlQueryAtomInAtomTable(ptr long ptr ptr ptr ptr)
 @ stdcall RtlQueryDepthSList(ptr)
 @ stdcall RtlQueryDynamicTimeZoneInformation(ptr)
diff --git a/include/winternl.h b/include/winternl.h
index f01344c9043..ed542292832 100644
--- a/include/winternl.h
+++ b/include/winternl.h
@@ -2694,6 +2694,7 @@ NTSYSAPI void      WINAPI RtlPopFrame(TEB_ACTIVE_FRAME*);
 NTSYSAPI BOOLEAN   WINAPI RtlPrefixString(const STRING*,const STRING*,BOOLEAN);
 NTSYSAPI BOOLEAN   WINAPI RtlPrefixUnicodeString(const UNICODE_STRING*,const UNICODE_STRING*,BOOLEAN);
 NTSYSAPI void      WINAPI RtlPushFrame(TEB_ACTIVE_FRAME*);
+NTSYSAPI NTSTATUS  WINAPI RtlQueryActivationContextApplicationSettings(DWORD,HANDLE,const WCHAR*,const WCHAR*,WCHAR*,SIZE_T,SIZE_T*);
 NTSYSAPI NTSTATUS  WINAPI RtlQueryAtomInAtomTable(RTL_ATOM_TABLE,RTL_ATOM,ULONG*,ULONG*,WCHAR*,ULONG*);
 NTSYSAPI NTSTATUS  WINAPI RtlQueryDynamicTimeZoneInformation(RTL_DYNAMIC_TIME_ZONE_INFORMATION*);
 NTSYSAPI NTSTATUS  WINAPI RtlQueryEnvironmentVariable_U(PWSTR,PUNICODE_STRING,PUNICODE_STRING);