Easy DiaAzul, your post made zero sense.
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The rendering engines in both windows and internet explorer depend upon capabilities within the base OS. Microsoft have had support for Windows Media Photo (which is the old name for HD Photo) available as download for XP and Vista for some time. It is, therefore, available throughout the Windows operating system.
With the release of Vista and change of name to HD Photo Microsoft is putting a renewed marketing push on the file format to capture more of the market share for digital imaging and photography. As an example of that consider their putchase of iView Media Pro - which has proven very popular and their amalgamation of a number of software packages under a common brand. Support for HD Photo (WMP) is available in Vista, as a download for XP and also as a plug-in for Photoshop CS2/3. They also provide device porting kits and support for developing code for embded devices (read: cameras).
Ultimately, whether HD Photo is a success or not is missing the point. Microsoft is going after the Media (or in narrow terms:photography/imaging) market and will do everything they can to be successful. On another branch of their strategy they are pushing strongly into mobile platforms (as is Apple with the iPhone). Bring the two strands together and it is not long, nor unrealistic, that we should see a Canon, Nikon or Sony camera sporting an Apple or Microsoft OS.
The desktop and camera is dead, long live the mobile multi-media platform.
[NB How long will it be after multi-media Canon professional cameras arrive that photographers on the touch line are downloaded customised shutter-tones and spiking their mates camera with some embarassing sound. You don't think that it is coming? Look at what the new breed of photography students are doing with their mobile phones today and think where we will be in five years time.]