Do not want IE notification bar displayed when downloading files

Using JavaScript to access a file on a server and create a program to open it in the client's exe.

It works as expected, but the notification bar of the browser (IE9) appears when I access the file on the server.I have to start exe without displaying this, but I'm having trouble because I don't know how to avoid it.
_{(The notification bar is the one that opens, saves, and cancels at the bottom of the browser screen.)}

The code is as follows.Open "result.myext" when the sample.cgi call is successful.

new Ajax.Request("sample.cgi", {
    method: "post",
    parameters: "param=123",
    onSuccess: function() {
        window.location.href="result.myext";
    }
});

The notification bar appears when onSuccess processes it, for example, if you write window.location.href="result.myext" before new Ajax.Request, exe starts without the notification bar.Therefore, I believe that there are no errors in setting the MIME or registry.

If you know any solution to why onSuccess is not possible, please let me know.

The running client (Windows 7) already has the following settings in the registry for the extension "myext".

• Associate the exe you want to run
• EditFlags65536
• BrowserFlags8

Also, the apache httpd.conf has the following settings for MIME "myext".

AddType application/myext.myext
<FilesMatch"\.myext$">
    Header set Content-Disposition inline
</FilesMatch>

Supplemental

• The running client is Windows 7 or later.Browsers are limited to IE9 and later.
• Windows XP and IE8 worked without displaying the Run/Save dialog, which corresponds to the notification bar in IE9.
• Another way is to monitor the success of sample.cgi in the timer and open result.myext, but the notification bar appears.
• The apache MIME setting seems to be able to launch the associated exe without it.
• The server is Windows Server 2008 R2, Apache 2.0.65
• prototype.js version uses 1.5.0.

Thank you for your cooperation.