SCORPION Z1) Как делаются формы стиля WinXP (есть отдельный компонент или через регионы)?
нужно подключить файл манифеста к проекту, если нужен стиль XP на win9x придется использовать сторонние библиотеки, например, http ну и конечно common controls версии 6.0

SCORPION Z
Пока ничего не понял. Речь идет о окнах с закругленными краями у всех
объектов формы(включая и её)
если нужны только скругленные края у формы, то это еще проще.
MSDN
Window Regions
In addition to the update region, every window has a visible region that defines the window portion visible to the user. The system changes the visible region for the window whenever the window changes size or whenever another window is moved such that it obscures or exposes a portion of the window. Applications cannot change the visible region directly, but the system automatically uses the visible region to create the clipping region for any display device context retrieved for the window.

The clipping region determines where the system permits drawing. When the application retrieves a display device context using the BeginPaint, GetDC, or GetDCEx function, the system sets the clipping region for the device context to the intersection of the visible region and the update region. Applications can change the clipping region by using functions such as SetWindowRgn, SelectClipPath and SelectClipRgn, to further limit drawing to a particular portion of the update area.

The WS_CLIPCHILDREN and WS_CLIPSIBLINGS styles further specify how the system calculates the visible region for a window. If a window has one or both of these styles, the visible region excludes any child window or sibling windows (windows having the same parent window). Therefore, drawing that would otherwise intrude in these windows will always be clipped.