diff --git a/src/common/platform/platform.hpp b/src/common/platform/platform.hpp
index f26dc677..6e8dff89 100644
--- a/src/common/platform/platform.hpp
+++ b/src/common/platform/platform.hpp
@@ -25,6 +25,7 @@
 #include "registry.hpp"
 #include "network.hpp"
 #include "threading.hpp"
+#include "window.hpp"
 
 #if defined(__GNUC__) || defined(__clang__)
 #pragma GCC diagnostic pop
diff --git a/src/common/platform/window.hpp b/src/common/platform/window.hpp
new file mode 100644
index 00000000..26a67d55
--- /dev/null
+++ b/src/common/platform/window.hpp
@@ -0,0 +1,40 @@
+#pragma once
+
+using pointer = uint64_t;
+
+#ifndef OS_WINDOWS
+typedef struct tagPOINT
+{
+    LONG x;
+    LONG y;
+} POINT, *PPOINT, NEAR *NPPOINT, FAR *LPPOINT;
+#endif
+
+using wparam = pointer;
+using lparam = pointer;
+using lresult = pointer;
+
+typedef struct _LARGE_STRING
+{
+    ULONG Length;
+    ULONG MaximumLength : 31;
+    ULONG bAnsi : 1;
+    pointer Buffer;
+} LARGE_STRING;
+
+using hwnd = pointer;
+using hmenu = pointer;
+using hinstance = pointer;
+
+struct msg
+{
+    hwnd hwnd;
+    UINT message;
+    wparam wParam;
+    lparam lParam;
+    DWORD time;
+    POINT pt;
+#ifdef _MAC
+    DWORD lPrivate;
+#endif
+};
diff --git a/src/windows-emulator/syscalls.cpp b/src/windows-emulator/syscalls.cpp
index 6b1e39f8..e3203b3b 100644
--- a/src/windows-emulator/syscalls.cpp
+++ b/src/windows-emulator/syscalls.cpp
@@ -718,18 +718,51 @@ namespace syscalls
         return STATUS_NOT_SUPPORTED;
     }
 
-    NTSTATUS handle_NtUserCreateWindowEx()
+    hwnd handle_NtUserCreateWindowEx(const syscall_context& c, const DWORD ex_style,
+                                     const emulator_object<LARGE_STRING> class_name,
+                                     const emulator_object<LARGE_STRING> cls_version,
+                                     const emulator_object<LARGE_STRING> window_name, const DWORD style, const int x,
+                                     const int y, const int width, const int height, const hwnd parent,
+                                     const hmenu menu, const hinstance instance, const pointer l_param,
+                                     const DWORD flags, const pointer acbi_buffer)
     {
+        (void)c;
+        (void)ex_style;
+        (void)class_name;
+        (void)cls_version;
+        (void)window_name;
+        (void)style;
+        (void)x;
+        (void)y;
+        (void)width;
+        (void)height;
+        (void)parent;
+        (void)menu;
+        (void)instance;
+        (void)l_param;
+        (void)flags;
+        (void)acbi_buffer;
+
         return STATUS_NOT_SUPPORTED;
     }
 
-    NTSTATUS handle_NtUserShowWindow()
+    NTSTATUS handle_NtUserShowWindow(const syscall_context& c, const hwnd hwnd, const LONG cmd_show)
     {
+        (void)c;
+        (void)hwnd;
+        (void)cmd_show;
         return STATUS_NOT_SUPPORTED;
     }
 
-    NTSTATUS handle_NtUserGetMessage()
+    NTSTATUS handle_NtUserGetMessage(const syscall_context& c, const emulator_object<msg> message, const hwnd hwnd,
+                                     const UINT msg_filter_min, const UINT msg_filter_max)
     {
+        (void)c;
+        (void)message;
+        (void)hwnd;
+        (void)msg_filter_min;
+        (void)msg_filter_max;
+
         return STATUS_NOT_SUPPORTED;
     }
 }