In Windows Vista or Windows Server 2008, when you run a Borland MS-DOS based application that uses the “Copyright (C) Rational Systems Inc.” signature in the extended header (rational extended header), you may receive the following error message:

The version of this file is not compatible with the version of Windows you’re running. Check your computer…

Consider the following scenario. Read operations or write operations are performed on a floppy disk that is running on an early Microsoft operating system. Examples of early Microsoft operating systems include the following:

• Microsoft Windows Millennium Edition
• Microsoft Windows 98 Second Edition
• Microsoft Windows 98
• Microsoft Windows 95
• Microsoft Windows 3.1
• MS-DOS

These operations may be performed slightly faster on one of these early Microsoft operating systems than on a newer Microsoft operating system. Examples of newer Microsoft operating systems include the following:

• Windows Vista
• Microsoft Windows Server 2003
• Microsoft Windows XP
• Microsoft Windows 2000
• Microsoft Windows NT

This behavior occurs if you use a floppy disk controller (FDC) that is 100-percent compatible with the original floppy disk controller. In a worst-case scenario, the difference in performance speed may be as much as 16 seconds.