IExplorer：当我们尝试从net加载文件时，弹出我自己的对话框而不是默认的IExplorer对话框

I am working on a project which need to customize the default functionality of IEXplorer. I need to pop up my own dialog instead of default IExplorer dialog(IExplorer run or save dialog window) when we trying to load a file from net. Is tere any way to do this? Plz reply.I am working on a project which need to customi