diff --git a/Contrib/MakeLangId/MakeLangId.cpp b/Contrib/MakeLangId/MakeLangId.cpp
index db9a1172..b23d6f44 100644
--- a/Contrib/MakeLangId/MakeLangId.cpp
+++ b/Contrib/MakeLangId/MakeLangId.cpp
@@ -343,6 +343,10 @@ INT_PTR CALLBACK DialogProc(HWND hDlg, UINT Msg, WPARAM wp, LPARAM lp)
 	HWND hCtl, hCtl2;
 	switch(Msg)
 	{
+	case WM_SIZE:
+		if (wp == SIZE_MAXIMIZED) ShowWindow(hDlg, SW_SHOWNOACTIVATE); // Disallow STARTF_USESHOWWINDOW+SW_MAXIMIZE
+		break;
+
 	case WM_COMMAND:
 		switch(wp)
 		{
diff --git a/Contrib/Makensisw/lookup.cpp b/Contrib/Makensisw/lookup.cpp
index c279e5dd..5281f510 100644
--- a/Contrib/Makensisw/lookup.cpp
+++ b/Contrib/Makensisw/lookup.cpp
@@ -179,6 +179,9 @@ static INT_PTR CALLBACK LookupDlgProc(HWND hDlg, UINT Msg, WPARAM WParam, LPARAM
 
   switch(Msg)
   {
+  case WM_SIZE:
+    if (WParam == SIZE_MAXIMIZED) ShowWindow(hDlg, SW_SHOWNOACTIVATE); // Disallow STARTF_USESHOWWINDOW+SW_MAXIMIZE
+    break;
   case WM_INITDIALOG:
     DIALOGDATA::Set(hDlg, (pDD = (DIALOGDATA*) LParam));
     CenterOnParent(hDlg);
diff --git a/Contrib/Makensisw/wndspy.cpp b/Contrib/Makensisw/wndspy.cpp
index 1be04a70..e1eb3044 100644
--- a/Contrib/Makensisw/wndspy.cpp
+++ b/Contrib/Makensisw/wndspy.cpp
@@ -288,6 +288,9 @@ static INT_PTR CALLBACK SpyDlgProc(HWND hDlg, UINT Msg, WPARAM WParam, LPARAM LP
   DIALOGDATA*pDD = DIALOGDATA::Get(hDlg);
   switch(Msg)
   {
+  case WM_SIZE:
+    if (WParam == SIZE_MAXIMIZED) ShowWindow(hDlg, SW_SHOWNOACTIVATE); // Disallow STARTF_USESHOWWINDOW+SW_MAXIMIZE
+    break;
   case WM_INITDIALOG:
     DIALOGDATA::Set(hDlg, (pDD = (DIALOGDATA*) LParam));
     CenterOnParent(hDlg);
diff --git a/Contrib/System/Source/System.h b/Contrib/System/Source/System.h
index 72103b84..6ad40270 100644
--- a/Contrib/System/Source/System.h
+++ b/Contrib/System/Source/System.h
@@ -59,7 +59,7 @@
 #define PAT_GUID        5
 #define PAT_CALLBACK    6
 #define PAT_REGMEM      7
-#ifdef _UNICODE
+#ifdef _UNICODE
 #define PAT_TSTRING     PAT_WSTRING
 #else
 #define PAT_TSTRING     PAT_STRING
diff --git a/Contrib/System/System.nsh b/Contrib/System/System.nsh
index 1443800d..ec1506b7 100644
--- a/Contrib/System/System.nsh
+++ b/Contrib/System/System.nsh
@@ -272,7 +272,7 @@
 !define /ifndef WS_CLIPSIBLINGS     0x04000000
 !define /ifndef WS_CLIPCHILDREN     0x02000000
 !define /ifndef WS_MAXIMIZE         0x01000000
-!define /ifndef WS_CAPTION          0x00C00000    
+!define /ifndef WS_CAPTION          0x00C00000
 !define /ifndef WS_BORDER           0x00800000
 !define /ifndef WS_DLGFRAME         0x00400000
 !define /ifndef WS_VSCROLL          0x00200000
diff --git a/Contrib/nsDialogs/nsDialogs.nsh b/Contrib/nsDialogs/nsDialogs.nsh
index b8f2020c..ca467229 100644
--- a/Contrib/nsDialogs/nsDialogs.nsh
+++ b/Contrib/nsDialogs/nsDialogs.nsh
@@ -39,9 +39,12 @@ Header file for creating custom installer pages with nsDialogs
 !define /ifndef WS_CLIPSIBLINGS      0x04000000
 !define /ifndef WS_CLIPCHILDREN      0x02000000
 !define /ifndef WS_MAXIMIZE          0x01000000
+!define /ifndef WS_BORDER            0x00800000
 !define /ifndef WS_VSCROLL           0x00200000
 !define /ifndef WS_HSCROLL           0x00100000
 !define /ifndef WS_GROUP             0x00020000
+!define /ifndef WS_MINIMIZEBOX       0x00020000
+!define /ifndef WS_MAXIMIZEBOX       0x00010000
 !define /ifndef WS_TABSTOP           0x00010000
 
 !define ES_LEFT              0x00000000
diff --git a/Contrib/zip2exe/main.cpp b/Contrib/zip2exe/main.cpp
index 659bef6b..5dfc89a0 100644
--- a/Contrib/zip2exe/main.cpp
+++ b/Contrib/zip2exe/main.cpp
@@ -633,6 +633,9 @@ INT_PTR CALLBACK DlgProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
   static HFONT hFont=0;
   switch (uMsg)
   {
+    case WM_SIZE:
+      if (wParam == SIZE_MAXIMIZED) ShowWindow(hwndDlg, SW_SHOWNOACTIVATE); // Disallow STARTF_USESHOWWINDOW+SW_MAXIMIZE
+    break;
     case WM_INITDIALOG:
       g_hwnd=hwndDlg;
       CheckDlgButton(hwndDlg,IDC_LZMA,BST_CHECKED);
diff --git a/Docs/src/history.but b/Docs/src/history.but
index 136cbfc4..f82afeaa 100644
--- a/Docs/src/history.but
+++ b/Docs/src/history.but
@@ -1,5 +1,19 @@
 \A{history} Changelog and Release Notes
 
+\H{v3.08} 3.08
+
+Released on ???? ??th, 20??
+
+\S1{v3.08-rl} Release Notes
+
+????????
+
+\S1{v3.08-cl} Changelog
+
+\S2{} Minor Changes
+
+\b Disallow start maximized mode
+
 \H{v3.07} 3.07
 
 Released on July 24th, 2021
diff --git a/Source/exehead/Ui.c b/Source/exehead/Ui.c
index 0f1e879d..c8ef727b 100644
--- a/Source/exehead/Ui.c
+++ b/Source/exehead/Ui.c
@@ -672,9 +672,14 @@ skipPage:
   }
   if (uMsg == WM_SIZE) {
     ShowWindow(m_bgwnd, wParam == SIZE_MINIMIZED ? SW_HIDE : SW_SHOW);
+#else //! NSIS_SUPPORT_BGBG
+  if (uMsg == WM_SIZE) {
+#endif //~ NSIS_SUPPORT_BGBG
+    if (wParam == SIZE_MAXIMIZED) {
+      DWORD style = (DWORD) GetWindowLongPtr(hwndDlg, GWL_STYLE), mask = WS_MAXIMIZEBOX|WS_MAXIMIZE|WS_MINIMIZE;
+      if ((style & mask) == WS_MAXIMIZE) ShowWindow(hwndDlg, SW_SHOWNOACTIVATE); // Disallow STARTF_USESHOWWINDOW+SW_MAXIMIZE unless someone does ${NSD_AddStyle} $hWndParent ${WS_MAXIMIZEBOX}
+    }
   }
-#endif //NSIS_SUPPORT_BGBG
-
   if (uMsg == WM_NOTIFY_CUSTOM_READY) {
     DestroyWindow(m_curwnd);
     m_curwnd = (HWND)wParam;