diff --git a/backends/imgui_impl_win32.cpp b/backends/imgui_impl_win32.cpp
index a40108d19..d2f595c14 100644
--- a/backends/imgui_impl_win32.cpp
+++ b/backends/imgui_impl_win32.cpp
@@ -1062,8 +1062,8 @@ static void ImGui_ImplWin32_CreateWindow(ImGuiViewport* viewport)
     // Create window
     RECT rect = { (LONG)viewport->Pos.x, (LONG)viewport->Pos.y, (LONG)(viewport->Pos.x + viewport->Size.x), (LONG)(viewport->Pos.y + viewport->Size.y) };
     ::AdjustWindowRectEx(&rect, vd->DwStyle, FALSE, vd->DwExStyle);
-    vd->Hwnd = ::CreateWindowEx(
-        vd->DwExStyle, _T("ImGui Platform"), _T("Untitled"), vd->DwStyle,       // Style, class name, window name
+    vd->Hwnd = ::CreateWindowExW(
+        vd->DwExStyle, L"ImGui Platform", L"Untitled", vd->DwStyle,       // Style, class name, window name
         rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top,    // Window area
         vd->HwndParent, nullptr, ::GetModuleHandle(nullptr), nullptr);          // Owner window, Menu, Instance, Param
     vd->HwndOwned = true;
@@ -1330,8 +1330,8 @@ static LRESULT CALLBACK ImGui_ImplWin32_WndProcHandler_PlatformWindow(HWND hWnd,
 
 static void ImGui_ImplWin32_InitPlatformInterface(bool platform_has_own_dc)
 {
-    WNDCLASSEX wcex;
-    wcex.cbSize = sizeof(WNDCLASSEX);
+    WNDCLASSEXW wcex;
+    wcex.cbSize = sizeof(WNDCLASSEXW);
     wcex.style = CS_HREDRAW | CS_VREDRAW | (platform_has_own_dc ? CS_OWNDC : 0);
     wcex.lpfnWndProc = ImGui_ImplWin32_WndProcHandler_PlatformWindow;
     wcex.cbClsExtra = 0;
@@ -1341,9 +1341,9 @@ static void ImGui_ImplWin32_InitPlatformInterface(bool platform_has_own_dc)
     wcex.hCursor = nullptr;
     wcex.hbrBackground = (HBRUSH)(COLOR_BACKGROUND + 1);
     wcex.lpszMenuName = nullptr;
-    wcex.lpszClassName = _T("ImGui Platform");
+    wcex.lpszClassName = L"ImGui Platform";
     wcex.hIconSm = nullptr;
-    ::RegisterClassEx(&wcex);
+    ::RegisterClassExW(&wcex);
 
     ImGui_ImplWin32_UpdateMonitors();
 
diff --git a/docs/CHANGELOG.txt b/docs/CHANGELOG.txt
index 4436d2c63..8a560d58b 100644
--- a/docs/CHANGELOG.txt
+++ b/docs/CHANGELOG.txt
@@ -84,6 +84,9 @@ Other changes:
 Docking+Viewports Branch:
 
 - Backends: SDL2, SDL3: Fixed building for UWP platforms. (#8008)
+- Backends: Win32: Use ResisterClassW()/CreateWindowExW() for secondary viewports, to
+  ensure correct IME input even if the backend was compiled in MBCS mode. (#7979, #5725)
+
 
 -----------------------------------------------------------------------
  VERSION 1.91.2 (Released 2024-09-19)