diff --git a/reactos/include/psdk/winerror.h b/reactos/include/psdk/winerror.h
index 485bdc9a700..5fde25b0728 100644
--- a/reactos/include/psdk/winerror.h
+++ b/reactos/include/psdk/winerror.h
@@ -1924,6 +1924,16 @@
 #define ERROR_SXS_MISSING_ASSEMBLY_IDENTITY_ATTRIBUTE 14079L
 #define ERROR_SXS_INVALID_ASSEMBLY_IDENTITY_ATTRIBUTE_NAME  14080
 
+#define ERROR_MUI_FILE_NOT_FOUND                           15100
+#define ERROR_MUI_INVALID_FILE                             15101
+#define ERROR_MUI_INVALID_RC_CONFIG                        15102
+#define ERROR_MUI_INVALID_LOCALE_NAME                      15103
+#define ERROR_MUI_INVALID_ULTIMATEFALLBACK_NAME            15104
+#define ERROR_MUI_FILE_NOT_LOADED                          15105
+#define ERROR_RESOURCE_ENUM_USER_STOP                      15106
+#define ERROR_MUI_INTLSETTINGS_UILANG_NOT_INSTALLED        15107
+#define ERROR_MUI_INTLSETTINGS_INVALID_LOCALE_NAME         15108
+
 /* HRESULT values for OLE, SHELL and other Interface stuff */
 /* the codes 4000-40ff are reserved for OLE */