Operating System Beta, etc. Wiki

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Operating System Beta, etc. Wiki

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 2015-07-29. This is the first version of 64-bit Windows to drop support for processors without the CMPXCHG16b, PrefetchW and LAHF/SAHF instructions, as running on these processors will result in a bugcheck with error code 0x5D.

Although the operating system was marketed by Microsoft as an update for Windows 8, Microsoft's traditional support policy treats Windows 8.1 as a service pack.[1]

It is the last release of Windows to have support for Windows Media Center as Microsoft discontinued support for the application with the release of Windows 10. It is also the last release of Windows to have the ability to create MS-DOS 8 startup disks, and thus to include MS-DOS in any form.

Main Changes


  • The Start button was brought back (although it still leads to the Metro start screen).
  • Computer is renamed to This PC.
  • Clicking the File Explorer icon in the taskbar takes you to This PC instead of Libraries, unlike in Windows 7 and 8. Additionally, Libraries is disabled by default, you can re-enable it by right-click on the navigation pane and choose "Show libraries" or "Show all folders".
  • User folders (Desktop, Documents, Downloads, Music, Pictures, Videos) added to This PC.
  • The Windows Experience Index has been removed. However, the command-line tool to determine the rating values (WinSAT) is still included.
  • New set of default wallpapers.
  • New customization options for the Start screen.
  • New Metro applications introduced, with many existing ones updated.
  • Redesigned PC Settings.

Update 1

  • When you hover over the top of a Metro app, Windows shows a title bar with minimize and close buttons.
  • Right-clicking on the Start screen opens up a menu instead of the touch-oriented controls at the bottom.
  • The "Go to the desktop instead of Start when I sign in" feature in Taskbar and Navigation Properties first introduced in the original release is now enabled by default.
  • You can pin Metro apps to the taskbar.
  • A power button has been added next to the search button on the start screen.
  • Added dividers between apps in the "All Apps" view in Start.
  • SkyDrive is renamed to OneDrive (you can also get this in Windows 8 and Windows 8.1 RTM (without Update 1) by updating the SkyDrive app via the Store).
  • The default media player and photo viewer has been changed to Windows Media Player and Windows Photo Viewer respectively.

Hardware Compatibility

Windows 8.1 is officially compatible with Intel processors up to Skylake (6th Generation). On Kaby Lake (7th Generation up to Coffee Lake (8th/9th Generation), 8.1 is not supported due to a lack of Windows Update and Intel Graphics, however, hacks have been made to get both working. For Ice Lake (10th Generation) up to Alder Lake (12th Generation), no known hacks have appeared for Intel Graphics, but the chipset drivers for Ice Lake, Tiger Lake (11th Generation), and Alder Lake have been confirmed to install without any issues.


Milestone 1

Buildlist-BlueDoubtful.png 9323.winmain.130222-????
Buildlist-BlueDoubtful.png 9347.0.winmain_bluem1.130220-1500
Buildlist-Green.png 9364.0.fbl_partner_out13.130315-2105
Buildlist-Green.png 9369.0.fbl_partner_out14.130324-1300

Milestone 2

Buildlist-Green.png 9374.0.fbl_partner_out15.130329-2355
Buildlist-Red.png 9375.fbl_partner_out14.130328-1742
Buildlist-Green.png 9379.0.fbl_partner_out16.130410-0711
Buildlist-BlueDoubtful.png 9380.winmain.130409-????
Buildlist-Green.png 9388.0.fbl_inx.130417-2217
Buildlist-Red.png 9388.fbl_partner_out18.130429-2155
Buildlist-Green.png 9389.0.fbl_inx_ace.130421-1800
Buildlist-BlueDoubtful.png 9402:fbl_srv2_partners.130509-2000
Buildlist-Red.png 9404.winmain_out20.130424-1425
Buildlist-Green.png 9410.fbl_partner_out21.130522-1653

Milestone Preview

Buildlist-Green.png 9411.0.winmain_bluemp.130522-1817
Buildlist-Green.png 9415.0.winmain.130524-1723
Buildlist-BlueDoubtful.png 9415.fbl_partner_out22.130525-0845
Buildlist-Green.png 9420.0.winmain.130603-1734
Buildlist-Green.png 9420.0.winmain_bluemp.130603-1815
Buildlist-Green.png 9421.0.winmain_bluemp.130604-1750
Buildlist-Green.png 9431.0.winmain_bluemp.130615-1214


Buildlist-Red.png 9433.0.winmain.130618-1322
Buildlist-Red.png 9434.0.winmain.130619-1547
Buildlist-Green.png 9453.0.winblue_rtm.130701-1010
Buildlist-Green.png 9456.0.winmain.130703-1803
Buildlist-Green.png 9460.0.winblue_rtm.130715-1059
Buildlist-Green.png 9464.0.winblue_rtm.130719-2145
Buildlist-Green.png 9466.0.winblue_rtm.130723-1416
Buildlist-BlueDoubtful.png 9468.0.winblue_rtm.130725-1203
Buildlist-Green.png 9471.0.winblue_rtm.130729-1022
Buildlist-Green.png 9477.winmain.130802-1938
Buildlist-Green.png 9477.fbl_partner_out31.130803-0736

RTM Escrow

Buildlist-Green.png 9489.0.winblue_rtm.130817-1357

Release to Manufacturing


GA Update

Buildlist-Green.png 9600.16404.winblue_gdr.130913-2141

Update 1 pre-release Builds

Buildlist-Green.png 9600.16610.winblue_s14.140201-1007
Buildlist-Red.png 9600.16615.winblue_s15.141102-1347
Buildlist-Green.png 9600.17019.winblue_gdr.140205-2003
Buildlist-Green.png 9600.17024.winblue_gdr_s14sku_partner.140214-1700
Buildlist-Green.png 9600.17025.winblue_gdr.140214-1706

Update 1

Buildlist-Green.png 9600.17041.winblue_gdr.140305-1710

Update 2

Buildlist-Green.png 9600.17238.winblue_gdr.140723-2018
Buildlist-Green.png 9600.17328.winblue_r3.140827-1500

Update 3

Buildlist-Green.png 9600.17415.winblue_r4.141028-1500
Buildlist-Green.png 9600.17476.winblue_r5.141029-1500