ASP.NET / IIS：404适用于所有文件类型

I set up 404 handler page in web.config, but it works ONLY when extension of URL is .aspx (or other which is handled by ASP.NET). I know I can setup static HTML page in website options, but I want to have a page. Is there any options to assign ASPX handler page for all request extensions in IIS?I set up 404 handler page in web.config, but it