diff --git a/Contrib/Modern UI/Changelog.txt b/Contrib/Modern UI/Changelog.txt
index 56394f66..cc4e3982 100644
--- a/Contrib/Modern UI/Changelog.txt	
+++ b/Contrib/Modern UI/Changelog.txt	
@@ -1,5 +1,8 @@
 NSIS Modern User Interface - VERSION HISTORY
 
+1.76 - September 23, 2006
+* Added MUI_ABORTWARNING_CANCEL_DEFAULT
+
 1.75 - April 1, 2006
 * Added show function for the start menu page
 * Added MUI_HEADER_TRANSPARENT_TEXT for transparent header texts
diff --git a/Contrib/Modern UI/Readme.html b/Contrib/Modern UI/Readme.html
index 8546fe40..b4d922f7 100644
--- a/Contrib/Modern UI/Readme.html	
+++ b/Contrib/Modern UI/Readme.html	
@@ -514,7 +514,9 @@ installer.</p>
 <div class="settings">
 <p><strong>MUI_ABORTWARNING_TEXT</strong> <span class=
 "parameter">text</span><br />
-Text to display on the abort warning messagebox.</p>
+Text to display on the abort warning message box.</p>
+<p><strong>MUI_ABORTWARNING_CANCEL_DEFAULT</strong><br />
+Set the Cancel button as the default button on the message box.</p>
 </div>
 </div>
 <h3><img class="trigger" alt="Open/Close section" id=
@@ -528,7 +530,9 @@ uninstaller.</p>
 <div class="settings">
 <p><strong>MUI_UNABORTWARNING_TEXT</strong> <span class=
 "parameter">text</span><br />
-Text to display on the abort warning messagebox.</p>
+Text to display on the abort warning message box.</p>
+<p><strong>MUI_UNABORTWARNING_CANCEL_DEFAULT</strong><br />
+Set the Cancel button as the default button on the message box.</p>
 </div>
 </div>
 </div>
@@ -1216,10 +1220,9 @@ Start Menu Folder page: <a href=
 <h1>Version History</h1>
 <div>
 <ul>
-<li>1.75 - April 1, 2006
+<li>1.76 - September 23, 2006
 <ul>
-<li>Added show function for the start menu page</li>
-<li>Added MUI_HEADER_TRANSPARENT_TEXT for transparent header texts</li>
+<li>Added MUI_ABORTWARNING_CANCEL_DEFAULT</li>
 </ul>
 </li>
 </ul>
diff --git a/Contrib/Modern UI/System.nsh b/Contrib/Modern UI/System.nsh
index 357835d1..19b0c41d 100644
--- a/Contrib/Modern UI/System.nsh	
+++ b/Contrib/Modern UI/System.nsh	
@@ -312,7 +312,11 @@ Var /GLOBAL MUI_TEMP2
     StrCmp $MUI_NOABORTWARNING "1" mui.quit
   !endif
 
-  MessageBox MB_YESNO|MB_ICONEXCLAMATION "${MUI_ABORTWARNING_TEXT}" IDYES mui.quit
+  !ifdef MUI_ABORTWARNING_CANCEL_DEFAULT
+    MessageBox MB_YESNO|MB_ICONEXCLAMATION|MB_DEFBUTTON2 "${MUI_ABORTWARNING_TEXT}" IDYES mui.quit
+  !else
+    MessageBox MB_YESNO|MB_ICONEXCLAMATION "${MUI_ABORTWARNING_TEXT}" IDYES mui.quit
+  !endif
 
   Abort
   mui.quit:
@@ -321,7 +325,11 @@ Var /GLOBAL MUI_TEMP2
 
 !macro MUI_UNABORTWARNING
 
-  MessageBox MB_YESNO|MB_ICONEXCLAMATION "${MUI_UNABORTWARNING_TEXT}" IDYES mui.quit
+  !ifdef MUI_UNABORTWARNING_CANCEL_DEFAULT
+    MessageBox MB_YESNO|MB_ICONEXCLAMATION|MB_DEFBUTTON2 "${MUI_UNABORTWARNING_TEXT}" IDYES mui.quit
+  !else
+    MessageBox MB_YESNO|MB_ICONEXCLAMATION "${MUI_UNABORTWARNING_TEXT}" IDYES mui.quit
+  !endif
 
   Abort
   mui.quit: