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Downloading Files with custom extensions not working in IE

Downloading Files with custom extensions not working in IE

Downloading Files with custom extensions not working in IE

We have a Windows 2008 Server running IIS and before today, we didn't have the MIME Type setup for some of our internally developed application extensions and would therefore get a 404 error whenever we would try to download a file with that extension.

After adding the extension to the MIME Types in IIS and setting the MIME Type to application/octet-stream, it would finally allow me to download the file via Chrome.

The problem comes when I try to download the file using IE10, it just gives me the XML text of the file as you can see in the attachment.

I've tried disabling protected mode like some posts say but it still doesn't fix the issue.

Has anyone ever seen this before?

Thanks in advance!

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