diff --git a/programs/taskmgr/column.c b/programs/taskmgr/column.c
index 688771dc882..aaa604620c9 100644
--- a/programs/taskmgr/column.c
+++ b/programs/taskmgr/column.c
@@ -493,9 +493,9 @@ void ProcessPage_OnViewSelectColumns(void)
 
     if (DialogBoxW(hInst, MAKEINTRESOURCEW(IDD_COLUMNS_DIALOG), hMainWnd, ColumnsDialogWndProc) == IDOK)
     {
-        for (i=Header_GetItemCount(hProcessPageHeaderCtrl)-1; i>=0; i--)
+        for (i=SendMessageW(hProcessPageHeaderCtrl, HDM_GETITEMCOUNT, 0, 0)-1; i>=0; i--)
         {
-            ListView_DeleteColumn(hProcessPageListCtrl, i);
+            SendMessageW(hProcessPageListCtrl, LVM_DELETECOLUMN, 0, i);
         }
 
         for (i=0; i<25; i++)
diff --git a/programs/taskmgr/proclist.c b/programs/taskmgr/proclist.c
index 07151c04de9..9bb26a77446 100644
--- a/programs/taskmgr/proclist.c
+++ b/programs/taskmgr/proclist.c
@@ -39,6 +39,7 @@ WNDPROC                OldProcessListWndProc;
 LRESULT CALLBACK ProcessListWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 {
     HBRUSH    hbrBackground;
+    int     count;
     RECT    rcItem;
     RECT    rcClip;
     HDC        hDC;
@@ -69,7 +70,7 @@ LRESULT CALLBACK ProcessListWndProc(HWND hWnd, UINT message, WPARAM wParam, LPAR
         /*
          * Get the background brush
          */
-        hbrBackground = (HBRUSH) GetClassLongPtr(hWnd, GCLP_HBRBACKGROUND);
+        hbrBackground = (HBRUSH) GetClassLongPtrW(hWnd, GCLP_HBRBACKGROUND);
 
         /*
          * Calculate the clip rect by getting the RECT
@@ -80,13 +81,14 @@ LRESULT CALLBACK ProcessListWndProc(HWND hWnd, UINT message, WPARAM wParam, LPAR
          * use icons in this list control.
          */
         rcClip.left = LVIR_BOUNDS;
-        SendMessage(hWnd, LVM_GETITEMRECT, 0, (LPARAM) &rcClip);
+        SendMessageW(hWnd, LVM_GETITEMRECT, 0, (LPARAM) &rcClip);
         rcItem.left = LVIR_BOUNDS;
-        SendMessage(hWnd, LVM_GETITEMRECT, ListView_GetItemCount(hWnd) - 1, (LPARAM) &rcItem);
+        count = SendMessageW(hWnd, LVM_GETITEMCOUNT, 0, 0);
+        SendMessageW(hWnd, LVM_GETITEMRECT, count - 1, (LPARAM) &rcItem);
 
         rcClip.bottom = rcItem.bottom;
         rcItem.left = LVIR_ICON;
-        SendMessage(hWnd, LVM_GETITEMRECT, 0, (LPARAM) &rcItem);
+        SendMessageW(hWnd, LVM_GETITEMRECT, 0, (LPARAM) &rcItem);
         rcClip.left = rcItem.right;
 
         /*
@@ -117,5 +119,5 @@ LRESULT CALLBACK ProcessListWndProc(HWND hWnd, UINT message, WPARAM wParam, LPAR
     /*
      * We pass on all messages except WM_ERASEBKGND
      */
-    return CallWindowProc(OldProcessListWndProc, hWnd, message, wParam, lParam);
+    return CallWindowProcW(OldProcessListWndProc, hWnd, message, wParam, lParam);
 }
diff --git a/programs/taskmgr/trayicon.c b/programs/taskmgr/trayicon.c
index b1379f531a2..8ef9ed45d30 100644
--- a/programs/taskmgr/trayicon.c
+++ b/programs/taskmgr/trayicon.c
@@ -64,8 +64,8 @@ static HICON TrayIcon_GetProcessorUsageIcon(void)
     /*
      * Load the bitmaps
      */
-    hBitmap = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_TRAYICON));
-    hBitmapMask = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_TRAYMASK));
+    hBitmap = LoadBitmapW(hInst, MAKEINTRESOURCEW(IDB_TRAYICON));
+    hBitmapMask = LoadBitmapW(hInst, MAKEINTRESOURCEW(IDB_TRAYMASK));
     if (!hBitmap || !hBitmapMask)
         goto done;