Windows 7 is gaining ground these days due to advanced and improved technologies like handwriting recognition,Direct Access,virtual hard disk support,enhanced performance on Multi-core processors,better user account access control,transparent gadgets,raw image viewing etc.Support for extension of themes were also included in windows7.Refer Windows 7 Themes
.Theme packs are cabinet files with an extension of .themepack, and consist of a .theme as well as any number of image, sound, icon, and mouse cursor files .The default theme is WINDOWS AERO,in most editions of windows 7 and windows vista ,giving a translucent feel to borders and margins.Users can still enhance their windows7 theme style by installing third party themes.Refer Windows 7 Dark Themes
.Windows 7 recognizes this file format automatically and will switch the user’s theme to the specified theme.
The best performance of windows7 themes can be viewed only with following minimum hardware requirement.
* a 1 GHz 32-bit (x86) or 64-bit (x64) processor
* 1 GB of system memory (512MB sometimes works but not recommended)
* a DirectX 9 compatible graphics processor with a Windows Display Driver Model (WDDM) driver, Pixel shader 2.0 in hardware, and a minimum of 128 MB of Video RAM
* 32 bits per pixel
* 40 GB hard drive with 15 GB free space
* DVD-ROM Drive