Open MS Project 2010 mpp file from a website link in IE8

[kurtvd]

Hello,
We're using MS Project Professional 2010, and we have a website that links to the .mpp files.
When I click on a link to an .mpp file, I get prompted with a file download dialog, where I click "Open" and MS Project opens, but then gives me this error:
View attachment 5195

When I click OK, the mpp file is opened in the browser window. It doesn't make any difference if I set a target on the link.
The message is not correct:
- File name and path are correct.
- File format is MS Project 2010 format, nothing wrong with that.
- It's not an early version file.

If I copy paste the link URL in Start > Run, then the file opens just fine inside MS Project 2010, so it's really the browser scenario that is failing here.
We're using Internet Explorer 8.0.6001.18702.
If I try this scenario with FireFox, it works perfect. The file opens in MS Project without any error.
Can I change this behaviour in IE8, so it will open mpp files in the client application, and not in the browser?

Thanks in advance,
Kurt

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