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    <p>As the other posters have said, you need to add the HTTP Content-Disposition header, with a value of attachment, to the HTTP response generated by IIS when serving the PNGs in question. </p> <p>Not sure what version of IIS you using are but:</p> <p>IIS6</p> <ol> <li>In the IIS Manager select the directory with the PNG files and open the Properties dialog</li> <li>Click the HTTP Headers tab.</li> <li>In the Custom HTTP Headers section, click Add.</li> <li>A dialog appears. In the "Custom-header name" field enter "Content-disposition". In the "Custom-header value field, enter "Attachment".</li> <li>You may have to restart IIS (iisreset) </li> </ol> <p>For IIS7:</p> <ol> <li>In the IIS Manager select the directory with the PNG files and select the Features view.</li> <li>Double-click the HTTP Response Headers item and then choose the Add option in the right-hand menu.</li> <li>A dialog appears. In the "Name" field enter "Content-disposition". In the "Value" field, enter "Attachment".</li> <li>You may have to restart IIS (iisreset) </li> </ol> <p>Alternatively, place this web.config in the folder with files:</p> <pre><code>&lt;?xml version="1.0"?&gt; &lt;configuration&gt; &lt;system.webServer&gt; &lt;httpProtocol&gt; &lt;customHeaders&gt; &lt;clear /&gt; &lt;add name="Content-Disposition" value="Attachment" /&gt; &lt;/customHeaders&gt; &lt;/httpProtocol&gt; &lt;/system.webServer&gt; &lt;/configuration&gt; </code></pre> <p>This should force the PNGs served from that directory to be downloadable.</p>
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