Build list legend
|Version of Microsoft Windows|
|OS family||Windows NT|
|Architecture||x86, x64, ARM32|
|Latest build||6.3.9600.17031.winblue_gdr.140221-1952 (Update 1)|
Windows 8.1 is an operating system by Microsoft. It is a free upgrade for existing Windows 8 users. It replaced Windows 8 and was succeeded by Windows 10 on 29 July 2015. This is the first version of 64-bit Windows to drop support for processors without CMPXCHG16b, PrefetchW and LAHF/SAHF, as running on these processors will result in a black screen with error code 0x5D. Despite that Windows 8.1 was marketed by Microsoft as an update for Windows 8, Microsoft's traditional support policy treats Windows 8.1 similar to previous Service Packs of Windows.