Because it was not previously possible to construct a device INF file for a newer operating system such that the INF would not be treated as valid under earlier releases, some vendors experienced problems with Windows 2000 when they needed to provide a different INF file for Windows NT 4.0. So, an INF file that has no .NT platform extensions and is intended only for Windows 98 might be chosen in preference to a lower ranked INF file that includes NT-decorated sections. Under Windows Whistler, an enhancement to the device INF file format resolves problems related to differentiating operating system versions. Vendors who do not need to differentiate between the two versions of Windows can provide customers with their existing, unchanged Windows 2000 INF files to install drivers on 32-bit versions of Windows Whistler. Details about using TargetOSVersion are provided later in this article.
Architecture Identifies the hardware platform.
This must be x86 or ia64 . A number representing the operating system's major version number. For Windows Whistler, this number is 5. A number representing the operating system's minor version number. For Windows Whistler, this number is 1.