Maybe EU should fine google like they do microsoft. But the countries tat actually make those decisions don't get that message. So much for the EU equality.

Did you send the response header "Content-Encoding:gzip" when serving the image?

He clearly did not, because if he did he would have noticed that it works. That IE tries to decode anyway is a bug.

As far as I know, the HTTP standard doesn't require browsers to decode content with a decoding mechanism if and only if it has been specified in the Content-Encoding header. I don't think this is a bug.

Yeah: http://news.ycombinator.com/item?id=4422015

Why not build a web app?

"to complement our web app"

My bad. But If a app will only be used for uploading files, you can do that in a web app. Every user would get a personalized link. No installation required.