diff --git a/src/os_win32.c b/src/os_win32.c
index 3f2de64..9c942c4 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -1043,7 +1043,7 @@
     }
 
     // check if it already has a valid unicode character.
-    if (pker->uChar.UnicodeChar > 0 && pker->uChar.UnicodeChar < 0xFFFD)
+    if (pker->uChar.UnicodeChar != 0)
 	return 1;
 
     CLEAR_FIELD(abKeystate);
@@ -1154,12 +1154,9 @@
 			else if (pker->wVirtualKeyCode >= VK_END
 				&& pker->wVirtualKeyCode <= VK_DOWN)
 			{
-			    // VK_END   0x23
-			    // VK_HOME  0x24
-			    // VK_LEFT  0x25
-			    // VK_UP    0x26
-			    // VK_RIGHT 0x27
-			    // VK_DOWN  0x28
+			    // (0x23 - 0x28): VK_END, VK_HOME,
+			    // VK_LEFT, VK_UP, VK_RIGHT, VK_DOWN
+
 			    *pmodifiers = 0;
 			    *pch2 = VirtKeyMap[i].chAlone;
 			    if ((nModifs & SHIFT) != 0
@@ -1167,7 +1164,7 @@
 			    {
 				*pch2 = VirtKeyMap[i].chShift;
 			    }
-			    else if ((nModifs & CTRL) != 0
+			    if ((nModifs & CTRL) != 0
 						     && (nModifs & ~CTRL) == 0)
 			    {
 				*pch2 = VirtKeyMap[i].chCtrl;
@@ -1178,17 +1175,38 @@
 				    *pch2 = VirtKeyMap[i].chAlone;
 				}
 			    }
-			    else if ((nModifs & ALT) != 0
-						      && (nModifs & ~ALT) == 0)
-			    {
-				*pch2 = VirtKeyMap[i].chAlt;
-			    }
-			    else if ((nModifs & SHIFT) != 0
+			    if ((nModifs & SHIFT) != 0
 						      && (nModifs & CTRL) != 0)
 			    {
 				*pmodifiers |= MOD_MASK_CTRL;
 				*pch2 = VirtKeyMap[i].chShift;
 			    }
+			    if ((nModifs & ALT) != 0)
+			    {
+				*pch2 = VirtKeyMap[i].chAlt;
+				*pmodifiers |= MOD_MASK_ALT;
+				if ((nModifs & ~ALT) == 0)
+				{
+				    *pch2 = VirtKeyMap[i].chAlone;
+				}
+				else if ((nModifs & SHIFT) != 0)
+				{
+				    *pch2 = VirtKeyMap[i].chShift;
+				}
+				else if ((nModifs & CTRL) != 0)
+				{
+				    if (pker->wVirtualKeyCode == VK_UP
+					|| pker->wVirtualKeyCode == VK_DOWN)
+				    {
+					*pmodifiers |= MOD_MASK_CTRL;
+					*pch2 = VirtKeyMap[i].chAlone;
+				    }
+				    else
+				    {
+					*pch2 = VirtKeyMap[i].chCtrl;
+				    }
+				}
+			    }
 			}
 			else
 			{
@@ -1319,7 +1337,7 @@
 	}
 	ker.dwControlKeyState |= s_dwMods;
 	ker.wVirtualKeyCode = vkCode;
-	ker.uChar.UnicodeChar = 0xFFFD;  // UNICODE REPLACEMENT CHARACTER
+	ker.uChar.UnicodeChar = 0;
 	ir->Event.KeyEvent = ker;
 	vim_free(action);
     }