How to Change Windows 7 Login Screen On The Fly

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Probably as you know, Windows 7 build 7057, to build Leaked to the public recently , sports a new (yet ugly) UI login background. Delivering on the "more customizable" promise, Windows 7 now Supports The Ability to load images Into the background of the login screen Without the use of third-party software or manual hacks.

• Although this functionality Was Designed with OEMs in mind, it is pretty easy to turn on and off using regedit and Some images lying around your hard drive.
  
  
• First, a check is made to determine if the customization functionality is enabled or not. More Precisely, a DWORD value named OEMBackground in the HKLM \ Software \ Microsoft \ Windows \ CurrentVersion \ Authentication \ LogonUI \ Background key is checked. Its data, of Boolean type, you define Behavior Whether or not this is turn on, ie 1 for enabled, 0 for disabled. This value May not exist by default, Depending on your system.
  
  
• Afterwards, if customization is enabled, the primary monitor's screen height and width are Retrieved via calls to GetSystemMetrics . These values are Used in the computation of the screen width (w) / height (h) ratio. For example, my desktop resolution is 1920 × 1200. The ratio, computed by the division of w / h, is 1.6:1.

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The result of this computation is in an internal look up table What That drives on disk image to load. Although I Do not have a large enough monitor to test, Higher Than it Appears Resolutions 1920 x 1200 will force the loading and zooming of an image of Closest compatibility (ie same ratio, smaller image).

As this is an OEM feature images are derived from% windir% \ system32 \ oobe \ info \ backgrounds. Like the registry value, this folder May not exist by default. The Following files (sorted by width-to-height ratio) are Supported in this folder:

• backgroundDefault.jpg
• background768x1280.jpg (0.6)
• background900x1440.jpg (0625)
• background960x1280.jpg (0.75)
• background1024x1280.jpg (0.8)
• background1280x1024.jpg (1.25)
• background1024x768.jpg (1.33-)
• background1280x960.jpg (1.33-)
• background1600x1200.jpg (1.33-)
• background1440x900.jpg (1.6)
• background1920x1200.jpg (1.6)
• background1280x768.jpg (1.66-)
• background1360x768.jpg (1.770833 ")

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NOTE: Images must be less Than 256kb in size. Thanks for pushing me to Investigate.

• BackgroundDefault.jpg The image is loaded and stretched-to-fit When a resolution / ratio-specific background can not be found. The other resolution / ratio-specific files are self-explanatory. If the background can not be loaded (eg Physically image too large, incorrect ratio, etc..) SKU-based default the image is loaded from imagesres.dll. You'll see a Windows Server-themed grayish background in there, too, suggesting this functionality is Not specific to client SKUs.
  
  
• Curious Corner - The RDP client, Used in the screenshots above, is something I put together Simply in C #. The System Center Virtual Machine Manager Microsoft does client Provided by The Ability to offer Whether or not control my keyboard hooked Was When in windowed-mode Therefore equating to an Unacceptable level of suckage.