Internet Explorer 10 in Windows Consumer Preview provides an option to control which experience of Internet Explorer--Metro style or on the desktop --to launch when clicking a link in another application.
For example, launching a link within a Metro app will launch the Metro styled IE10, whereas launching a link using a desktop app will launch the standard IE10 interface. You can override this default behavior using the Programs tab of the Internet Properties dialog.
"The default for this setting is 'Let Internet Explorer decide.' In other words, links will launch into the appropriate experience based on the invoking context--desktop or Metro style. Links will open in the desktop IE10 when a link is clicked from a desktop application, for example, Microsoft Word, and in Metro style IE10 when a link is opened from a Metro style application," Kevin Luu, in a post on IE team blog stated.
IE10 is available in both Metro style and desktop experiences when it's the default browser.
"If IE10 isn't your default browser, only desktop IE is available and you cannot change IE's Browser Launch Settings. The "Choose how you open links" option on the Programs tab of the Internet Properties dialog will be disabled ("grayed out") when IE is not the default browser," Luu explains.
To change the default browser, type "default" on the Windows 8 Start screen. Select "Internet Explorer" and then click or touch "Set this program as default." This will set IE10 as the default browser on Windows 8 and enable its Metro style experience.
You can locate these settings quickly by using the Start screen's search capability and searching for terms such as "links," "launch," or "open links." Show below is the result of search for the term "launch."