diff --git a/src/core/libraries/libscecommondialog.h b/src/core/libraries/libscecommondialog.h
index 43d62897..1f5edb4e 100644
--- a/src/core/libraries/libscecommondialog.h
+++ b/src/core/libraries/libscecommondialog.h
@@ -7,6 +7,12 @@
 
 namespace Libraries::CommonDialog {
 
+struct OrbisCommonDialogBaseParam {
+    std::size_t size;
+    u8 reserved[36];
+    u32 magic;
+};
+
 int PS4_SYSV_ABI _ZN3sce16CommonDialogUtil12getSelfAppIdEv();
 int PS4_SYSV_ABI _ZN3sce16CommonDialogUtil6Client11closeModuleEv();
 int PS4_SYSV_ABI _ZN3sce16CommonDialogUtil6Client11updateStateEv();
diff --git a/src/core/libraries/libscemsgdialog.cpp b/src/core/libraries/libscemsgdialog.cpp
index a9d578f4..0a590357 100644
--- a/src/core/libraries/libscemsgdialog.cpp
+++ b/src/core/libraries/libscemsgdialog.cpp
@@ -28,8 +28,11 @@ int PS4_SYSV_ABI sceMsgDialogInitialize() {
     return ORBIS_OK;
 }
 
-int PS4_SYSV_ABI sceMsgDialogOpen() {
-    PRINT_UNIMPLEMENTED_FUNCTION_NAME();
+s32 PS4_SYSV_ABI sceMsgDialogOpen(const OrbisMsgDialogParam* param) {
+    PRINT_DUMMY_FUNCTION_NAME();
+    OrbisMsgDialogUserMessageParam* userMsgParam = param->userMsgParam;
+    const char* msg = userMsgParam->msg;
+    printf("sceMsgDialogOpen msg : %s", msg);
     return ORBIS_OK;
 }
 
diff --git a/src/core/libraries/libscemsgdialog.h b/src/core/libraries/libscemsgdialog.h
index a685c383..e51f1a15 100644
--- a/src/core/libraries/libscemsgdialog.h
+++ b/src/core/libraries/libscemsgdialog.h
@@ -4,14 +4,87 @@
 #pragma once
 
 #include "library_common.h"
+#include "libscecommondialog.h"
 
 namespace Libraries::MsgDialog {
 
+using OrbisUserServiceUserId = s32;
+
+enum OrbisMsgDialogMode {
+    ORBIS_MSG_DIALOG_MODE_USER_MSG = 1,
+    ORBIS_MSG_DIALOG_MODE_PROGRESS_BAR = 2,
+    ORBIS_MSG_DIALOG_MODE_SYSTEM_MSG = 3,
+};
+
+enum OrbisMsgDialogButtonType {
+    ORBIS_MSG_DIALOG_BUTTON_TYPE_OK = 0,
+    ORBIS_MSG_DIALOG_BUTTON_TYPE_YESNO = 1,
+    ORBIS_MSG_DIALOG_BUTTON_TYPE_NONE = 2,
+    ORBIS_MSG_DIALOG_BUTTON_TYPE_OK_CANCEL = 3,
+    ORBIS_MSG_DIALOG_BUTTON_TYPE_WAIT = 5,
+    ORBIS_MSG_DIALOG_BUTTON_TYPE_WAIT_CANCEL = 6,
+    ORBIS_MSG_DIALOG_BUTTON_TYPE_YESNO_FOCUS_NO = 7,
+    ORBIS_MSG_DIALOG_BUTTON_TYPE_OK_CANCEL_FOCUS_CANCEL = 8,
+    ORBIS_MSG_DIALOG_BUTTON_TYPE_2BUTTONS = 9,
+};
+
+enum OrbisMsgDialogProgressBarType {
+    ORBIS_MSG_DIALOG_PROGRESSBAR_TYPE_PERCENTAGE = 0,
+    ORBIS_MSG_DIALOG_PROGRESSBAR_TYPE_PERCENTAGE_CANCEL = 1,
+};
+
+enum OrbisMsgDialogSystemMessageType {
+    ORBIS_MSG_DIALOG_SYSMSG_TYPE_TRC_EMPTY_STORE = 0,
+    ORBIS_MSG_DIALOG_SYSMSG_TYPE_TRC_PSN_CHAT_RESTRICTION = 1,
+    ORBIS_MSG_DIALOG_SYSMSG_TYPE_TRC_PSN_UGC_RESTRICTION = 2,
+    ORBIS_MSG_DIALOG_SYSMSG_TYPE_CAMERA_NOT_CONNECTED = 4,
+    ORBIS_MSG_DIALOG_SYSMSG_TYPE_WARNING_PROFILE_PICTURE_AND_NAME_NOT_SHARED = 5,
+};
+
+struct OrbisMsgDialogButtonsParam {
+    const char* msg1;
+    const char* msg2;
+    char reserved[32];
+};
+
+struct OrbisMsgDialogUserMessageParam {
+    OrbisMsgDialogButtonType buttonType;
+    s32 : 32;
+    const char* msg;
+    OrbisMsgDialogButtonsParam* buttonsParam;
+    char reserved[24];
+};
+
+struct OrbisMsgDialogProgressBarParam {
+    OrbisMsgDialogProgressBarType barType;
+    int32_t : 32;
+    const char* msg;
+    char reserved[64];
+};
+
+struct OrbisMsgDialogSystemMessageParam {
+    OrbisMsgDialogSystemMessageType sysMsgType;
+    char reserved[32];
+};
+
+struct OrbisMsgDialogParam {
+    CommonDialog::OrbisCommonDialogBaseParam baseParam;
+    std::size_t size;
+    OrbisMsgDialogMode mode;
+    s32 : 32;
+    OrbisMsgDialogUserMessageParam* userMsgParam;
+    OrbisMsgDialogProgressBarParam* progBarParam;
+    OrbisMsgDialogSystemMessageParam* sysMsgParam;
+    OrbisUserServiceUserId userId;
+    char reserved[40];
+    s32 : 32;
+};
+
 int PS4_SYSV_ABI sceMsgDialogClose();
 int PS4_SYSV_ABI sceMsgDialogGetResult();
 int PS4_SYSV_ABI sceMsgDialogGetStatus();
 int PS4_SYSV_ABI sceMsgDialogInitialize();
-int PS4_SYSV_ABI sceMsgDialogOpen();
+s32 PS4_SYSV_ABI sceMsgDialogOpen(const OrbisMsgDialogParam* param);
 int PS4_SYSV_ABI sceMsgDialogProgressBarInc();
 int PS4_SYSV_ABI sceMsgDialogProgressBarSetMsg();
 int PS4_SYSV_ABI sceMsgDialogProgressBarSetValue();
diff --git a/src/core/libraries/libscesystemservice.h b/src/core/libraries/libscesystemservice.h
index 593b9c88..13b4fd18 100644
--- a/src/core/libraries/libscesystemservice.h
+++ b/src/core/libraries/libscesystemservice.h
@@ -8,7 +8,7 @@
 
 namespace Libraries::SystemService {
 
-enum OrbisSystemServiceParamId : s32 {
+enum OrbisSystemServiceParamId {
     ORBIS_SYSTEM_SERVICE_PARAM_ID_LANG = 1,
     ORBIS_SYSTEM_SERVICE_PARAM_ID_DATE_FORMAT = 2,
     ORBIS_SYSTEM_SERVICE_PARAM_ID_TIME_FORMAT = 3,
@@ -19,18 +19,18 @@ enum OrbisSystemServiceParamId : s32 {
     ORBIS_SYSTEM_SERVICE_PARAM_ID_ENTER_BUTTON_ASSIGN = 1000
 };
 
-enum OrbisSystemParamDateFormat : s32 {
+enum OrbisSystemParamDateFormat {
     ORBIS_SYSTEM_PARAM_DATE_FORMAT_YYYYMMDD = 0,
     ORBIS_SYSTEM_PARAM_DATE_FORMAT_DDMMYYYY = 1,
     ORBIS_SYSTEM_PARAM_DATE_FORMAT_MMDDYYYY = 2
 };
 
-enum OrbisSystemParamTimeFormat : s32 {
+enum OrbisSystemParamTimeFormat {
     ORBIS_SYSTEM_PARAM_TIME_FORMAT_12HOUR = 0,
     ORBIS_SYSTEM_PARAM_TIME_FORMAT_24HOUR = 1
 };
 
-enum OrbisSystemParamGameParentalLevel : s32 {
+enum OrbisSystemParamGameParentalLevel {
     ORBIS_SYSTEM_PARAM_GAME_PARENTAL_OFF = 0,
     ORBIS_SYSTEM_PARAM_GAME_PARENTAL_LEVEL01 = 1,
     ORBIS_SYSTEM_PARAM_GAME_PARENTAL_LEVEL02 = 2,
@@ -45,12 +45,12 @@ enum OrbisSystemParamGameParentalLevel : s32 {
     ORBIS_SYSTEM_PARAM_GAME_PARENTAL_LEVEL11 = 11
 };
 
-enum OrbisSystemParamEnterButtonAssign : s32 {
+enum OrbisSystemParamEnterButtonAssign {
     ORBIS_SYSTEM_PARAM_ENTER_BUTTON_ASSIGN_CIRCLE = 0,
     ORBIS_SYSTEM_PARAM_ENTER_BUTTON_ASSIGN_CROSS = 1
 };
 
-enum OrbisSystemParamLanguage : s32 {
+enum OrbisSystemParamLanguage {
     ORBIS_SYSTEM_PARAM_LANG_JAPANESE = 0,
     ORBIS_SYSTEM_PARAM_LANG_ENGLISH_US = 1,
     ORBIS_SYSTEM_PARAM_LANG_FRENCH = 2,
@@ -438,7 +438,8 @@ int PS4_SYSV_ABI sceSystemServiceGetAppIdOfBigApp();
 int PS4_SYSV_ABI sceSystemServiceGetAppIdOfMiniApp();
 int PS4_SYSV_ABI sceSystemServiceGetAppStatus();
 int PS4_SYSV_ABI sceSystemServiceGetAppType();
-s32 PS4_SYSV_ABI sceSystemServiceGetDisplaySafeAreaInfo(OrbisSystemServiceDisplaySafeAreaInfo* info);
+s32 PS4_SYSV_ABI
+sceSystemServiceGetDisplaySafeAreaInfo(OrbisSystemServiceDisplaySafeAreaInfo* info);
 int PS4_SYSV_ABI sceSystemServiceGetEventForDaemon();
 int PS4_SYSV_ABI sceSystemServiceGetGpuLoadEmulationMode();
 int PS4_SYSV_ABI sceSystemServiceGetHdrToneMapLuminance();
diff --git a/src/core/libraries/libsceuserservice.h b/src/core/libraries/libsceuserservice.h
index 42213b9b..016b6b28 100644
--- a/src/core/libraries/libsceuserservice.h
+++ b/src/core/libraries/libsceuserservice.h
@@ -36,14 +36,14 @@ struct OrbisUserServiceRegisteredUserIdList {
     OrbisUserServiceUserId userId[ORBIS_USER_SERVICE_MAX_REGISTER_USERS];
 };
 
-enum OrbisUserServiceUserColor : s32 {
+enum OrbisUserServiceUserColor {
     ORBIS_USER_SERVICE_USER_COLOR_BLUE = 0,
     ORBIS_USER_SERVICE_USER_COLOR_RED = 1,
     ORBIS_USER_SERVICE_USER_COLOR_GREEN = 2,
     ORBIS_USER_SERVICE_USER_COLOR_PINK = 3,
 };
 
-enum OrbisUserServiceEventType : s32 {
+enum OrbisUserServiceEventType {
     SCE_USER_SERVICE_EVENT_TYPE_LOGIN = 0,  // Login event
     SCE_USER_SERVICE_EVENT_TYPE_LOGOUT = 1, // Logout event
 };