Article ID: 103012 - View products that this article applies to.
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In Windows NT, Windows 3.x virtual device drivers (VXDs) written for 16-bit applications do not work.
Virtual device drivers were originally written to take advantage of 386 enhanced mode functionality in previous versions of Windows (3.x). The VXDs registered themselves in the SYSTEM.INI file upon installation of the application that required their presence.
In Windows NT, these VXDs do not function properly. In most cases, these drivers talk directly to hardware by virtualizing the device to be used. By design, Windows NT does not allow applications to communicate with the hardware directly. Applications that require the use of VXDs must be rewritten to function properly with Windows NT.