An issue that has been going on for some time now is an inability to correctly download certain files using Microsoft Internet Explorer 9. You will find that the download dialog launches but the file name and type that Internet Explorer 9 displays does not correlate with the original download link.
The most likely cause of this is having a tick in the check box next to the following option
“Do Not Save Encrypted pages to disk”
You can verify this setting by opening Internet Explorer 9, clicking “Tools”, “Internet Options”, Clicking the “Advanced” tab and then scrolling down to the “Security” section. This is where you will find the “Do Not Save Encrypted pages to disk” value.
To resolve the issue just untick the box next to “Do Not Save Encrypted pages to disk” and then close and re-launch your Internet Explorer 9 browser.