diff --git a/base/shell/explorer/traywnd.cpp b/base/shell/explorer/traywnd.cpp
index 542c71c1dd5..576630a3359 100644
--- a/base/shell/explorer/traywnd.cpp
+++ b/base/shell/explorer/traywnd.cpp
@@ -99,6 +99,20 @@ VOID RestoreWindowPos()
     g_WindowPosBackup.RemoveAll();
 }
 
+BOOL CanBeMinimized(HWND hwnd)
+{
+    if (::IsWindowVisible(hwnd) && !::IsIconic(hwnd) && ::IsWindowEnabled(hwnd))
+    {
+        if (::GetClassLongPtrW(hwnd, GCW_ATOM) == (ULONG_PTR)WC_DIALOG)
+            return TRUE;
+
+        DWORD exstyle = (DWORD)::GetWindowLongPtrW(hwnd, GWL_EXSTYLE);
+        if (!(exstyle & WS_EX_TOPMOST))
+            return TRUE;
+    }
+    return FALSE;
+}
+
 struct EFFECTIVE_INFO
 {
     HWND hwndFound;
@@ -113,7 +127,7 @@ FindEffectiveProc(HWND hwnd, LPARAM lParam)
 {
     EFFECTIVE_INFO *pei = (EFFECTIVE_INFO *)lParam;
 
-    if (!IsWindowVisible(hwnd) || IsIconic(hwnd))
+    if (!CanBeMinimized(hwnd))
         return TRUE;    // continue
 
     if (pei->hTrayWnd == hwnd || pei->hwndDesktop == hwnd ||
@@ -159,13 +173,6 @@ IsThereAnyEffectiveWindow(BOOL bMustBeInMonitor)
     ei.bMustBeInMonitor = bMustBeInMonitor;
 
     EnumWindows(FindEffectiveProc, (LPARAM)&ei);
-    if (ei.hwndFound && FALSE)
-    {
-        WCHAR szClass[64], szText[64];
-        GetClassNameW(ei.hwndFound, szClass, _countof(szClass));
-        GetWindowTextW(ei.hwndFound, szText, _countof(szText));
-        MessageBoxW(NULL, szText, szClass, 0);
-    }
     return ei.hwndFound != NULL;
 }
 
@@ -2689,7 +2696,7 @@ ChangePos:
 
     LRESULT OnCopyData(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
     {
-        COPYDATASTRUCT *pCopyData = reinterpret_cast<COPYDATASTRUCT *>(lParam);
+        COPYDATASTRUCT *pCopyData = (COPYDATASTRUCT *)lParam;
         switch (pCopyData->dwData)
         {
             case TABDMC_APPBAR:
@@ -3262,16 +3269,14 @@ HandleTrayContextMenu:
                 return TRUE;
         }
 
-        if (::IsWindowVisible(hwnd) && !::IsIconic(hwnd))
+        if (CanBeMinimized(hwnd))
         {
-            MINWNDPOS mwp;
-            mwp.hwnd = hwnd;
-            mwp.wndpl.length = sizeof(mwp.wndpl);
-            ::GetWindowPlacement(hwnd, &mwp.wndpl); // Save the position and status
-
-            info->pMinimizedAll->Add(mwp);
-
-            ::ShowWindowAsync(hwnd, SW_MINIMIZE);
+            MINWNDPOS mwp = { hwnd, { sizeof(mwp.wndpl) } };
+            if (::GetWindowPlacement(hwnd, &mwp.wndpl) && // Save the position and status
+                ::ShowWindowAsync(hwnd, SW_SHOWMINNOACTIVE)) // Minimize
+            {
+                info->pMinimizedAll->Add(mwp);
+            }
         }
 
         return TRUE;
@@ -3309,9 +3314,7 @@ HandleTrayContextMenu:
         {
             HWND hwnd = g_MinimizedAll[i].hwnd;
             if (::IsWindowVisible(hwnd) && ::IsIconic(hwnd))
-            {
                 ::SetWindowPlacement(hwnd, &g_MinimizedAll[i].wndpl);
-            }
         }
 
         g_MinimizedAll.RemoveAll();