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This is the Windows BETA release of the HD Photo, also known as Windows Media Photo, file format plug-in for Adobe® Photoshop® software. It supports a wide range of pixel formats (including high dynamic range, wide gamut formats) and numerous advanced HD Photo features. This BETA plug-in is designed for use with the CS2 or CS3 versions of Adobe® Photoshop® software running under Microsoft Windows XP or Microsoft Windows Vista. Any other use is not supported. Because this is a BETA release, we recommend you use careful judgment before using this version of the plug-in for any production work. This BETA version will expire after May 31st, 2007.

Instructions
When running the installation program, you are prompted for the Photoshop plug-ins directory where the plug-in should be installed. The default location is crogram FilesAdobePhotoshop CS2Plug-insFile Formats, the file formats plug-ins directory for Adobe Photoshop. If you want to use this plug-in with a version of Adobe Photoshop installed in a different location, including use with the beta release of Adobe Photoshop CS3, you will need to browse to the specific file format plug-ins directory for your Photoshop installation. The setup program will not search for or verify the presence of your installation of Adobe Photoshop.

If you inadvertently install the plug-in to the wrong directory, you can un-install it using the “Add/Remove Programs” control panel in Windows XP or the “Programs and Features” control panel in Windows Vista. Then re-install the plug-in and specify the correct installation sub-directory. Alternately, you can install the plug-in to a temporary directory and then manually copy the plug-in file to the appropriate Photoshop plug-ins directory. If this technique is used, the standard process for un-installing the plug-in will not work; you will need to manually delete the plug-in file to un-install it.

This is BETA software!, please use caution when installing it on your system
Download: HD Photo Plug-in for Adobe Photoshop (Freeware)
Link: More Information | Forum Discussion (Thanks CoolCatBad)