As a security precaution, it is recommended that you cancel the download.' It is either corrupt or it has an incorrect file type. The 'File Download' window states the following (in addition to a Save and a Cancel button): 'The file you are downloading cannot be opened by the default program. Internet Explorer 9 - 'File Download' window issueĬhrome 9.0.597.98 (with Adobe Reader 9.4.2 plugin enabled and Chrome PDF Viewer disabled) - No Issues Internet Explorer 8 - 'File Download' window issue Again, before the release of Adobe Reader 9.4.2, there was no issues with our website's PDFs opening in IE browsers. We have not released any updates for at least a month. Our website generates USPS labels using Siberix ReportWriter software. Prior to this update our users have had no issues with opening PDFs generated by our website. The recent Adobe Reader 9.4.2 is causing issues with PDFs opening in IE 8 and 9 browsers.