Windows Classic

Windows Classic refers to the built-in native look and feel of Microsoft Windows, specifically the variation that has been introduced with Windows 95 and further refined in later system versions. Unlike other visual styles, which are implemented using  resource files, the classic theme is implemented directly in the User API and offers more customization of various element sizes and colors. At its peak, Windows 2000 offered 22 different presets for the classic theme, including 4 high contrast accessibility presets and some of which were also available in larger sizes.

The only major change to the classic theme backend to occur since Windows 95 is the introduction of support for two-color gradients for window captions in Windows 98 when using a 256 colors mode or higher.

Ever since Windows XP introduced a theme engine, which allowed more complex modification to the system's look and feel, the classic theme is no longer used by default in client versions, but it could still be enabled in the Control Panel. Most of the color schemes have been removed in Windows Vista, except for Windows Standard, the High Contrast ones and Windows Classic, while the latter has been removed in Windows 7. Although server versions also included the theme engine, the classic theme was still used as the default theme due to performance reasons up to Windows Server 2008 R2. Until Windows 8, the classic theme was used to implement high contrast settings.

With the introduction of software rendering in the Desktop Window Manager and the Aero Lite visual style, which also allows modification to a degree similar to the classic theme, it is no longer accessible by the user in Windows 8 and equivalent versions, with Windows Server 2012 switching to Aero Lite and Windows PE using Windows Basic, however, the implementation is still present for compatibility reasons and an application can ask the theme engine to disable theming for its windows, which will force the classic theme. Elements of the classic theme are also used by applications that did not explicitly enable visual styling support in their manifest.

Trivia

 * In non-English versions of Windows XP, the Windows Classic theme defaults to the Windows Classic color scheme, rather than the Windows Standard scheme.
 * In Windows 98, the appearance of a window's main menu changed. Rather than a blue highlight that only showed when the menu was open, the menus now have a button-like appearance that becomes inset when the menu is opened. However, this change was not reflected in the Microsoft Plus! Desktop Themes applet.
 * The Classic Theme uses the Marlett font to render glyphs, such as the caption button icons. If the Marlett font is missing, these will render with the System font, which appears broken. For example, the caption button icons will read "0 1 r".