Disposition") not opening file in IE6

I'm using Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.HtmlEncode(FileName)); to pop a 'open/save file' dialog for the users, so that they can download an file on to their local machines.

This is working good normally in IE7,But on IE6 the file is not opening when user click on the open button in 'open/save file' dialog. I gone through the net and found that Response.AddHeader("Content-Disposition", "inline; filename="+Server.HtmlEncode(FileName)); should be provide to work that in IE6,and its works fine..

But the issue is most of the files that can open in browser opens on the page itself.. ie user on a mail page and click download an image file it opens there,, i need it to open in another window as in case of IE7 what can i do... other files that cannot open in bowser open with current application in system ie(word,excel etc)..

please suggest a method to stick with same code for both IEs... The Code i used is here....

Response.AddHeader("Content-Disposition", "attachment; filename=" +FileName);
Response.AddHeader("Content-Length", file.Length.ToString());
Response.ContentType = ReturnExtension(file.Extension.ToLower());
Response.TransmitFile(file.FullName);
Response.End();

 private string ReturnExtension(string fileExtension)
    {
        switch (fileExtension)
        {
            case ".txt":
                return "text/plain";
            case ".doc":
                return "application/ms-word";
            case ".xls":
                return "application/vnd.ms-excel";
            case ".gif":
                return "image/gif";
            case ".jpg":
            case "jpeg":
                return "image/jpeg";
            case ".bmp":
                return "image/bmp";
            case ".wav":
                return "audio/wav";
            case ".ppt":
                return "application/mspowerpoint";
            case ".dwg":
                return "image/vnd.dwg";
            default:
                return "application/octet-stream";
        }
    }

---

我发现在IE 6中的问题，我们必须阅读的内容和使用缓冲区和二进制写入在IE 6中打开文件，下面的代码在IE6中正常工作

FileStream sourceFile = new FileStream(Server.MapPath(@"FileName"), FileMode.Open);
float FileSize;
FileSize = sourceFile.Length;
byte[] getContent = new byte[(int)FileSize];
sourceFile.Read(getContent, 0, (int)sourceFile.Length);
sourceFile.Close();
Response.ClearContent();
Response.ClearHeaders();
Response.Buffer = true;
Response.ContentType = ReturnExtension(file.Extension.ToLower());
Response.AddHeader("Content-Length", getContent.Length.ToString());
Response.AddHeader("Content-Disposition", "attachment; filename=" + FileName);
Response.BinaryWrite(getContent);
Response.Flush();
Response.End();

---

尝试将此设置的内容类型设置为八位字节流：

Response.ContentType = "application/octet-stream";

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