in asp.net there opposite proceed record contingency transmitted firefox?

i am controlling asp.net broadcast .jar file. formula works ideally ie. however firefox record downloads, corrupt. best proceed repair it? next formula i am using.

private vacant transferfile()
{
    try
    {
        twine filepath = server.mappath("somejarfile.jar");

        fileinfo record = new fileinfo(filepath);

        (file.exists)
        {
            // pristine calm response
            //response.clearcontent();
            response.clear();

            // line1: supplement record name attachment, force open/cance/save dialog show, header
            response.addheader("content-disposition", "attachment; filename=" + file.name);

            // supplement record distance response header
            response.addheader("content-length", file.length.tostring());

            // set contenttype
            response.contenttype = returnextension(file.extension.tolower());

            // record response
            //response.transmitfile(file.fullname);
            response.writefile(file.fullname);

            // finish response
            response.end();
        }
        else
        {
            this.response.write("error awaiting file.  greatfully try again.");
            this.response.flush();
        }
    }
    locate (exception ex)
    {
        this.response.write(string.format("error: {0}", ex.message));
    }
}



private twine returnextension(string fileextension)
{
    switch (fileextension)
    {
        box ".htm":
        box ".html":
        box ".log":
            relapse "text/html";
        box ".txt":
            relapse "text/plain";
        box ".doc":
            relapse "application/ms-word";
        box ".tiff":
        box ".tif":
            relapse "image/tiff";
        box ".asf":
            relapse "video/x-ms-asf";
        box ".avi":
            relapse "video/avi";
        box ".zip":
            relapse "application/zip";
        box ".xls":
        box ".csv":
            relapse "application/vnd.ms-excel";
        box ".gif":
            relapse "image/gif";
        box ".jpg":
        box "jpeg":
            relapse "image/jpeg";
        box ".bmp":
            relapse "image/bmp";
        box ".wav":
            relapse "audio/wav";
        box ".mp3":
            relapse "audio/mpeg3";
        box ".mpg":
        box "mpeg":
            relapse "video/mpeg";
        box ".rtf":
            relapse "application/rtf";
        box ".asp":
            relapse "text/asp";
        box ".pdf":
            relapse "application/pdf";
        box ".fdf":
            relapse "application/vnd.fdf";
        box ".ppt":
            relapse "application/mspowerpoint";
        box ".dwg":
            relapse "image/vnd.dwg";
        box ".msg":
            relapse "application/msoutlook";
        box ".xml":
        box ".sdxl":
            relapse "application/xml";
        box ".xdp":
            relapse "application/vnd.adobe.xdp+xml";
        box ".jar":
            relapse "application/java-archive";
        default:
            relapse "application/octet-stream";
    }
} 

update:

i total form

case ".jar":
    relapse "application/java-archive";

and repair problem. i zipped adult .jar record means transmitted fine.

i notice i tested againist localhost record downloaded issues. however i pull adult web server i problem.