A dialog box created by a version 4.0 application automatically receives the DS_3DLOOK style. This style gives three-dimensional borders to child controls in the dialog box and draws the entire dialog box using the three-dimensional color scheme. The DS_3DLOOK style is available to a dialog box created by a version 3.x application, but you must explicitly add the style to the dialog box template. The application that creates the dialog box determines the version number of the dialog box.
Windows 95 performs a strict validation check on the DS_ styles specified in a dialog box template. If the template contains any styles that Windows 95 does not recognize and a version 4.0 application is creating the dialog box, the creation fails. If a version 3.x application is creating the dialog box, the system debugger generates a warning, but Windows 95 creates the dialog box anyway.