Official themes on the other hand have the advantage of being signed meaning that there is no need to tamper with the uxtheme.dll file that protects the operating system from unofficial themes. Vishal over at Ask VG discovered a new signed Windows XP theme that is also compatible with Windows Server 2003 that can be installed without changing system files.

He discovered the theme in the Windows Embedded Standard CTP Refresh distribution and provided download links to it. The theme is supplied as a self extracting executable that installs the theme in the right location in Windows. The theme can then be selected from the Themes tab in the Display Properties.

The main benefit of this theme is that it is signed. Many users will probably still prefer unsigned themes because of the choice of thousands of themes instead of the handful of signed ones. Take a look at my Windows Vista Theme Customization article for information about applying custom themes to Windows Vista or the Windows XP Theme Royal Noir which is also signed.