Posted 3 November 2008 Tweet
If you've ever downloaded a CHM documentation file and received a "Navigation to the webpage was canceled" message, you need to 'Unblock' the CHM file before opening it. This was a security improvement in Windows Vista, and there's no clear message that indicates that you need to jump through this hoop.
I saw a few reports of folks unable to open the Silverlight Toolkit's documentation file, and this is how to successfully open it. This is the same process for any CHM that you download - including, for instance, the excellent offline Silverlight SDK docs.
Here's what it looks like when your CHM file is not yet unblocked:
To fix this, simply right-click on the CHM file in explorer and select the 'Properties' menu item:
Then, click the 'Unblock' button near the bottom of the properties page:
You can then open the file and should see the first page in the file:
Hope this helps.
Jeff Wilcox is a software development engineer at Microsoft who leads exciting open source projects on the Windows Azure team. Jeff has been at Microsoft 8 years and is an alumnus of the University of Michigan.
Jeff leads the open source Windows Azure SDK and cross-platform command line tools development team at Microsoft. Offering tooling for OS X, Windows and Linux and SDKs for Node.js, Java, .NET, PHP, Python; the work is open source, licensed under the Apache 2 license.
4th & Mayor is the top-rated social app on the Windows Phone Store with thousands of five star reviews. The best foursquare experience for Windows Phone, it is powered by a Node.js backend running on Windows Azure & Amazon Web Services. Jeff Wilcox is the developer of the app.