Customizing 'Save As' Dialog box provided by browser at client side
<p>I am developing code in Java and facing the following problem:</p>

<p>I need to download a excel file on client side. When user hits the 'Download' button, a Pop up with 'Save', 'Open' and 'Cancel' button appears which is provided by browser. When user will click on 'Save' button, a 'Save As' dialog box opens which is again provided by browser, in this dialog box there is 'Save As Type' dropdown.</p>

<p>I need to customize this dropdown and I want to show '.xls' and '.xlsx' extention type in this dropdown, and when user chooses any of extention type , file saves in that format.</p>

<p>So is it possible to customize client side browser given 'Save As' dialog Box and if yes than how??</p>
