Word和Excel文件没有在我的asp.net网站上下载

Question

如果我尝试下载.txt / .msg / .pdf / .png / .jpg，下面的代码可以工作，但如果我尝试下载exccel或word文件则会失败。有人可以帮忙吗

        Response.ContentType = "APPLICATION/OCTET-STREAM";
        //Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";

        fileUrl = Server.UrlDecode(fileUrl);
        System.String disHeader = "attachment; filename=\"" + fileUrl + "\"";
        Response.AppendHeader("Content-Disposition", disHeader);
        // transfer the file byte-by-byte to the response object 
        System.IO.FileInfo fileToDownload = new System.IO.FileInfo(fileUrl);
        Response.Flush();
        Response.WriteFile(fileToDownload.FullName);