This does not solve the problem with powerpointIf there is a problem with PowerPoint, there will be problems with other software
I found the solution for this problem.I think powerpoint uses different way of getting the mouseevent from other applications.Change the method of setting the mouse position, and it will work well.Change the code in this way.Line 68-71 of Form1.cs:long->uintLine 192 of Form1.cs:SetCursorPos((int)warpedX, (int)warpedY);->mouse_event(MOUSEEVENTF_ABSOLUTE | MOUSEEVENTF_MOVE, (uint)(warpedX * 65535 / screenWidth), (uint)(warpedY * 65535 / screenHeight), 0, 0);I attached the fixed version of wii whiteboard.