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I have a URL and I want to launch it in the default browser. I've tried two methods: Process.Start("http://stackoverflow.com"); ... and the one detailed in this other question using ShellExecute. In both cases I get the error: Windows cannot find ' http://stackoverflow.com '. Make sure you typed the name correctly, and then try again. It shouldn't be trying to open it as a file though... from what I understand, it should recognize it as a URL and open it in the default browser. What am I missing? By the way: OS = Vista, and .NET = 3.5 EDIT : According to this MS KB article , since Process.Start sets the UseShellExecute by default, it should launch the default browser. EDIT : Here's what does work: System.Diagnostics.Process.Start(@"C:\Program Files\Internet Explorer\IExplore.exe", "http://stackoverflow.com"); Unfortunately that really doesn't launch the default browser, and it also doesn't work if IE isn't installed in the "normal" place. I'm not sure what to do here. More information : OK, so the error I'm getting is error number -2147467259. Looking at Google for this, it appears that it's not very descriptive. It might be a file association error or something. The plot thickens : So I checked the registry key that's supposed to have my file association for http: KEY_CLASSES_ROOT\http\shell\open\command\default Here's the value: "C:\Program Files\Mozilla Firefox\firefox.exe" -requestPending -osint -url "%1" That makes sense. I actually copied this string

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