diff --git a/addons/advanced_ballistics/config.cpp b/addons/advanced_ballistics/config.cpp
index 32f1406a07..1a2187783b 100644
--- a/addons/advanced_ballistics/config.cpp
+++ b/addons/advanced_ballistics/config.cpp
@@ -15,4 +15,8 @@ class CfgPatches {
 #include "CfgEventHandlers.hpp"
 #include "CfgVehicles.hpp"
 #include "RscTitles.hpp"
-#include "ACE_Settings.hpp"
\ No newline at end of file
+#include "ACE_Settings.hpp"
+
+class ACE_Extensions {
+    extensions[] += {"ace_advanced_ballistics"};
+};
diff --git a/addons/common/XEH_postInit.sqf b/addons/common/XEH_postInit.sqf
index 2599e12a6d..3a16ac9d43 100644
--- a/addons/common/XEH_postInit.sqf
+++ b/addons/common/XEH_postInit.sqf
@@ -248,5 +248,13 @@ if(isMultiplayer && { time > 0 || isNull player } ) then {
     }, 0, []] call cba_fnc_addPerFrameHandler;
 };
 
+// check dlls
+{
+    if (_x callExtension "version" == "") then {
+        private "_errorMsg";
+        _errorMsg = format ["Extension %1.dll not installed.", _x];
 
-
+        diag_log text format ["[ACE] ERROR: %1", _errorMsg];
+        ["[ACE] ERROR", _errorMsg, {findDisplay 46 closeDisplay 0}] call FUNC(errorMessage);
+    };
+} forEach getArray (configFile >> "ACE_Extensions" >> "extensions");
diff --git a/addons/common/XEH_preInit.sqf b/addons/common/XEH_preInit.sqf
index aebc13df95..54a5118cb0 100644
--- a/addons/common/XEH_preInit.sqf
+++ b/addons/common/XEH_preInit.sqf
@@ -42,6 +42,7 @@ PREP(doAnimation);
 PREP(dropBackpack);
 PREP(endRadioTransmission);
 PREP(eraseCache);
+PREP(errorMessage);
 PREP(execNextFrame);
 PREP(execPersistentFnc);
 PREP(execRemoteFnc);
diff --git a/addons/common/config.cpp b/addons/common/config.cpp
index 769ba37de1..16bd13fc0c 100644
--- a/addons/common/config.cpp
+++ b/addons/common/config.cpp
@@ -152,3 +152,15 @@ class CfgUIGrids {
         };
     };
 };
+
+/*
+// check dll
+class RscStandardDisplay;
+class RscDisplayMain: RscStandardDisplay {
+    onLoad = QUOTE([ARR_4(""onLoad"",_this,""RscDisplayMain"",'GUI')] call  (uinamespace getvariable 'BIS_fnc_initDisplay'); [ARR_5('header','tail',{0},{},_this select 0)] call COMPILE_FILE(functions\fnc_errorMessage));
+};
+*/
+
+class ACE_Extensions {
+    extensions[] = {};
+};
diff --git a/addons/common/functions/fnc_errorMessage.sqf b/addons/common/functions/fnc_errorMessage.sqf
new file mode 100644
index 0000000000..e061772942
--- /dev/null
+++ b/addons/common/functions/fnc_errorMessage.sqf
@@ -0,0 +1,144 @@
+/*
+ * Author: commy2, based on BIS_fnc_errorMsg and BIS_fnc_guiMessage by Karel Moricky (BI)
+ * Stops simulation and opens a textbox with error message.
+ *
+ * Arguments:
+ * ?
+ *
+ * Return Value:
+ * None
+ *
+ * Public: No
+ */
+#include "script_component.hpp"
+
+disableSerialization;
+endLoadingScreen;
+
+private ["_textHeader", "_textMessage", "_onOK", "_onCancel"];
+
+_textHeader = _this select 0;
+_textMessage = _this select 1;
+_onOK = ARR_SELECT(_this,2,{});
+_onCancel = ARR_SELECT(_this,3,{});
+
+if (typeName _textMessage == "STRING") then {
+    _textMessage = parseText _textMessage;
+};
+
+(ARR_SELECT(_this,4,call BIS_fnc_displayMission)) createDisplay "RscDisplayCommonMessagePause";
+
+private ["_display", "_ctrlRscMessageBox", "_ctrlBcgCommonTop", "_ctrlBcgCommon", "_ctrlText", "_ctrlBackgroundButtonOK", "_ctrlBackgroundButtonMiddle", "_ctrlBackgroundButtonCancel", "_ctrlButtonOK", "_ctrlButtonCancel"];
+
+_display = uiNamespace getVariable "RscDisplayCommonMessage_display";
+_ctrlRscMessageBox =          _display displayCtrl 2351;
+_ctrlBcgCommonTop =           _display displayCtrl 235100;
+_ctrlBcgCommon =              _display displayCtrl 235101;
+_ctrlText =                   _display displayCtrl 235102;
+_ctrlBackgroundButtonOK =     _display displayCtrl 235103;
+_ctrlBackgroundButtonMiddle = _display displayCtrl 235104;
+_ctrlBackgroundButtonCancel = _display displayCtrl 235105;
+_ctrlButtonOK =               _display displayCtrl 235106;
+_ctrlButtonCancel =           _display displayCtrl 235107;
+
+_ctrlBcgCommonTop ctrlSetText _textHeader;
+
+private ["_ctrlButtonOKPos", "_ctrlBcgCommonPos", "_bottomSpaceY", "_ctrlTextPos", "_marginX", "_marginY"];
+
+_ctrlButtonOKPos = ctrlPosition _ctrlButtonOK;
+_ctrlBcgCommonPos = ctrlPosition _ctrlBcgCommon;
+_bottomSpaceY = (_ctrlButtonOKPos select 1) - ((_ctrlBcgCommonPos select 1) + (_ctrlBcgCommonPos select 3));
+
+_ctrlTextPos = ctrlPosition _ctrlText;
+_marginX = (_ctrlTextPos select 0) - (_ctrlBcgCommonPos select 0);
+_marginY = (_ctrlTextPos select 1) - (_ctrlBcgCommonPos select 1);
+
+private ["_ctrlTextPosH", "_bottomPosY"];
+
+_ctrlText ctrlSetStructuredText _textMessage;
+_ctrlTextPosH = ctrlTextHeight _ctrlText;
+
+_ctrlBcgCommon ctrlSetPosition [
+    _ctrlBcgCommonPos select 0,
+    _ctrlBcgCommonPos select 1,
+    _ctrlBcgCommonPos select 2,
+    _ctrlTextPosH + _marginY * 2
+];
+_ctrlBcgCommon ctrlCommit 0;
+
+_ctrlText ctrlSetPosition [
+    (_ctrlBcgCommonPos select 0) + _marginX,
+    (_ctrlBcgCommonPos select 1) + _marginY,
+    (_ctrlBcgCommonPos select 2) - _marginX * 2,
+    _ctrlTextPosH
+];
+_ctrlText ctrlCommit 0;
+
+_bottomPosY = (_ctrlBcgCommonPos select 1) + _ctrlTextPosH + (_marginY * 2) + _bottomSpaceY;
+
+{
+    private "_xPos";
+    _xPos = ctrlPosition _x;
+
+    _xPos set [1, _bottomPosY];
+    _x ctrlSetPosition _xPos;
+    _x ctrlCommit 0;
+} foreach [
+    _ctrlBackgroundButtonOK,
+    _ctrlBackgroundButtonMiddle,
+    _ctrlBackgroundButtonCancel,
+    _ctrlButtonOK,
+    _ctrlButtonCancel
+];
+
+private ["_ctrlRscMessageBoxPos", "_ctrlRscMessageBoxPosH"];
+
+_ctrlRscMessageBoxPos = ctrlPosition _ctrlRscMessageBox;
+_ctrlRscMessageBoxPosH = _bottomPosY + (_ctrlButtonOKPos select 3);
+
+_ctrlRscMessageBox ctrlSetPosition [
+    0.5 - (_ctrlBcgCommonPos select 2) / 2,
+    0.5 - _ctrlRscMessageBoxPosH / 2,
+    (_ctrlBcgCommonPos select 2) + 0.5,
+    _ctrlRscMessageBoxPosH
+];
+
+_ctrlRscMessageBox ctrlEnable true;
+_ctrlRscMessageBox ctrlCommit 0;
+
+if (_onOK isEqualTo {}) then {
+    _ctrlButtonOK ctrlEnable false;
+    _ctrlButtonOK ctrlSetFade 0;
+    _ctrlButtonOK ctrlSetText "";
+    _ctrlButtonOK ctrlCommit 0;
+} else {
+    _ctrlButtonOK ctrlEnable true;
+    _ctrlButtonOK ctrlSetFade 0;
+    _ctrlButtonOK ctrlSetText localize "STR_DISP_OK";
+    _ctrlButtonOK ctrlCommit 0;
+
+    ctrlSetFocus _ctrlButtonOK;
+};
+
+if (_onCancel isEqualTo {}) then {
+    _ctrlButtonCancel ctrlEnable false;
+    _ctrlButtonCancel ctrlSetFade 0;
+    _ctrlButtonCancel ctrlSetText "";
+    _ctrlButtonCancel ctrlCommit 0;
+} else {
+    _ctrlButtonCancel ctrlEnable true;
+    _ctrlButtonCancel ctrlSetFade 0;
+    _ctrlButtonCancel ctrlSetText localize "STR_DISP_CANCEL";
+    _ctrlButtonCancel ctrlCommit 0;
+
+    ctrlSetFocus _ctrlButtonCancel;
+};
+
+_ctrlButtonOK ctrlAddEventHandler ["buttonClick", {(ctrlParent (_this select 0)) closeDisplay 1; true}];
+_ctrlButtonCancel ctrlAddEventHandler ["buttonClick", {(ctrlParent (_this select 0)) closeDisplay 2; true}];
+
+GVAR(errorOnOK) = _onOK;
+GVAR(errorOnCancel) = _onCancel;
+
+_display displayAddEventHandler ["unload", {call ([{}, GVAR(errorOnOK), GVAR(errorOnCancel)] select (_this select 1))}];
+_display displayAddEventHandler ["keyDown", {_this select 1 == 1}];
diff --git a/addons/common/script_component.hpp b/addons/common/script_component.hpp
index 279785f223..7c266c169d 100644
--- a/addons/common/script_component.hpp
+++ b/addons/common/script_component.hpp
@@ -11,4 +11,4 @@
     #define DEBUG_SETTINGS DEBUG_SETTINGS_COMMON
 #endif
 
-#include "\z\ace\addons\main\script_macros.hpp"
+#include "\z\ace\addons\main\script_macros.hpp"
\ No newline at end of file
diff --git a/addons/fcs/config.cpp b/addons/fcs/config.cpp
index 711cbbbd25..12edf02ba3 100644
--- a/addons/fcs/config.cpp
+++ b/addons/fcs/config.cpp
@@ -20,3 +20,7 @@ class CfgPatches {
 #include "CfgWeapons.hpp"
 
 #include "CfgOptics.hpp"
+
+class ACE_Extensions {
+    extensions[] += {"ace_fcs"};
+};
diff --git a/addons/interact_menu/config.cpp b/addons/interact_menu/config.cpp
index 139ff2db97..81d2dc3f75 100644
--- a/addons/interact_menu/config.cpp
+++ b/addons/interact_menu/config.cpp
@@ -36,3 +36,7 @@ class ACE_Settings {
         displayName = "$STR_ACE_Interact_Menu_UseListMenu";
     };
 };
+
+class ACE_Extensions {
+    extensions[] += {"ace_breakLine"};
+};