Windows 10 build 9883

6.4.9883.0.fbl_release.141106-1705
	Build of Windows 10
OS family	Windows NT
Version number	6.4
Build number	9883
Build revision	0
Architecture	x64
Build lab	fbl_release
Compiled on	2014-11-06
Expiration date
Timebomb	2015-04-15 (+160 days)
SKUs
	Core; Pro; Pro with Media Center (edition upgrade only)
About dialog

Windows 10 build 9883 is a build of Windows 10. The x64 Pro checked/debug compile of this build was originally uploaded to BetaArchive on 19 September 2015.^[1] The free compile containing both the Core and Pro SKUs, was later uploaded on 22 April 2022.

It is the last available build to use the 6.4 kernel version. The debug version of this build contains many development apps used to test the basic capabilities of what a Metro/UWP app can potentially do.

Changes[edit | edit source]

Settings[edit | edit source]

The PC Settings app has been renamed to Settings.
Most pages have been reorganized into new categories.
There are now separate pages for managing Wi-Fi, Ethernet, and VPN settings.
There is now a dedicated search box on the sidebar. However, the search charm will still open to show results.

Findings[edit | edit source]

Hidden features[edit | edit source]

The following hidden features have been found within this build:

XAML Logon UI[edit | edit source]

It can be enabled by merging the following registry file:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\LogonUI\TestHooks]
"Threshold"=dword:00000001

The key will take effect immediately and the new logon UI should appear.

XAML Start menu[edit | edit source]

It can be enabled by merging the following registry file:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\ImmersiveShell\Launcher]
"UseExperience"=dword:00000001

After merging the registry file, log off and log back in for it to start working.

It should be noted that in the current stage of development it's highly unstable and has a chance of crashing and not working at all.

Search box on the taskbar[edit | edit source]

It can be enabled by merging the following registry key:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Search]
"EnableSearchBox"=dword:00000001

After that, right click on the taskbar, and click on Search and select Show search box. Even if the user later disables it, it'll stay available.

Due to being early in development, the user can right click on it and perform the same tasks that can be done on a regular edit box.

Move the toast notifications to the bottom[edit | edit source]

Toast notifications can be moved to the bottom, like in later builds of Windows 10, can be done by merging this registry file:

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer]
"DisplayToastAtBottom"=dword:00000001

After doing that, log off and log back in for the change to take effect.

Internal Insider page[edit | edit source]

It can be enabled by merging the following registry key:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsSelfHost\Applicability]
"ThresholdOptedIn"=dword:00000001
"ThresholdInternal"=dword:00000001

Microsoft Eva (Mobile) voice[edit | edit source]

It can be enabled by merging the following registry key:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Speech\Voices\Tokens\MSTTS_V110_enUS_EvaM]
@="Microsoft Eva Mobile - English (United States)"
"409"="Microsoft Eva Mobile - English (United States)"
"CLSID"="{179F3D56-1B0B-42B2-A962-59B7EF59FE1B}"
"LangDataPath"=hex(2):25,00,77,00,69,00,6e,00,64,00,69,00,72,00,25,00,5c,00,53,\
00,70,00,65,00,65,00,63,00,68,00,5f,00,4f,00,6e,00,65,00,43,00,6f,00,72,00,\
65,00,5c,00,45,00,6e,00,67,00,69,00,6e,00,65,00,73,00,5c,00,54,00,54,00,53,\
00,5c,00,65,00,6e,00,2d,00,55,00,53,00,5c,00,4d,00,53,00,54,00,54,00,53,00,\
4c,00,6f,00,63,00,65,00,6e,00,55,00,53,00,2e,00,64,00,61,00,74,00,00,00
"VoicePath"=hex(2):25,00,77,00,69,00,6e,00,64,00,69,00,72,00,25,00,5c,00,53,00,\
70,00,65,00,65,00,63,00,68,00,5f,00,4f,00,6e,00,65,00,43,00,6f,00,72,00,65,\
00,5c,00,45,00,6e,00,67,00,69,00,6e,00,65,00,73,00,5c,00,54,00,54,00,53,00,\
5c,00,65,00,6e,00,2d,00,55,00,53,00,5c,00,4d,00,31,00,30,00,33,00,33,00,45,\
00,76,00,61,00,00,00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Speech\Voices\Tokens\MSTTS_V110_enUS_EvaM\Attributes]
"Age"="Adult"
"Gender"="Female"
"Version"="11.0"
"Language"="409"
"Name"="Microsoft Eva Mobile"
"SharedPronunciation"=""
"Vendor"="Microsoft"
"DataVersion"="11.0.2013.1022"

After that, it can be used within the Text to Speech properties and other places that use the same voices.

Test UWP apps[edit | edit source]

This build's debug compile comes with many development UWP apps to test various functionality. These UWP apps are all a part of the Windows Communication apps (microsoft.windowscommunicationsapps), which in retail builds includes the Calendar, Mail and People apps.

The list of the debug apps in this build is as follows:

AddressWell Test App - tests the contact picker
AddressWellUT - unit test for the contact picker
Assert - reports assert failures for apps
AttachmentWellUT - unit test for the "attachment well" - possibly a file picker
Calendar - the regular Calendar app
Calendar Provider Test - lets the user perform various actions with the calendar, however crashes when the button to do the action is pressed
CalendarTest - Calendar app with mock data, doesn't require a sign in, and retains the user's added events
CalendarUT - unit test for the calendar
CalPlatUT - unit test for the calendar platform
CanvasUT - unit tests for the canvas
CommUT - unit tests for the communication platform
FontSelectorUT - unit test for the font selector
FromControlUT - unit test for the from control - possibly the "From" field in an e-mail client
IC Test - lets the user test how various communications controls react to various data
JxUT - unit tests for "Jx"
Mail - the regular Mail app. Doesn't seem to load
MailTest - Mail app with mock data
MailUT - unit tests for the Mail app
MenuArrowKeyHandlerUT - unit test for the menu arrow key handler - some sort of menu
People - People app with the ability to use mock data
PeopleUT - unit tests for the People
Picker Test - lets the user test the contact picker
PlatformUT - unit tests for the platform
Protocol Activation Test App - lets the user test launching the People app via various protocols
SendASmileUT - unit test for Send a Smile - possibly a feedback tool
ShareAnythingUT - unit test for Share Anything
ShareTargetTestApp - lets the user test sharing to an app. As it's a share target, content can be shared to this app from another app, where it pops up as a charm and shows information about the shared content
ShareTargetUT - unit tests for the share target
Sharing Test - lets the user test sharing to another app
Skype Test App - lets the user test Skype activation parameters
SyncUT - unit tests for syncing
TAEF Tailored Application Host Process - crashes on startup
TAEF Tailored Managed Application Host Process - crashes on startup
Test Harness - lets the user test various things relating to communication apps
TxUT - unit tests for "Tx"
Windows Live From Control Test App - lets the user test the "From" control
Windows Live Modern Canvas Test App - crashes on startup

Gallery[edit | edit source]

AddressWell Test App
Calendar Provider Test
CalendarTest
IC Test
MailTest
People (splash page)
People (main page with mock data)
Picker Test
Protocol Activation Test App
ShareTargetTestApp
ShareTargetTestApp being shared to from Sharing Test
Sharing Test
Skype Test App
Test Harness
Windows Live From Control Test App

Unit test app[edit | edit source]

The UI is the same between all the unit test apps. Only the unit tests themselves differ.

Unit test selection
Running unit tests
Results page

Bugs and quirks[edit | edit source]

Metro applications[edit | edit source]

This build's Metro applications are known to be unstable, notable problems include a memory leak in the Settings app and most developer apps not working correctly.

Desktop Window Manager[edit | edit source]

Desktop Window Manager in this build is missing some newer window animations that were introduced in build 9860 and build 9879 despite having a later compile date.

Shutdown crash[edit | edit source]

There is a chance of the system crashing when shutting down.

Installation[edit | edit source]

The Debug version of this build is not installable by default due to a corrupt msi.dll file in the install.wim. To install this build, apply the xdelta patch against the ISO file to restore the proper msi.dll file.

Incorrect window thumbnail border color[edit | edit source]

If window auto-colorization is enabled, the window thumbnail borders on the taskbar do not change color even after the wallpaper changes. This issue can be remedied by manually changing the window color through the Control Panel or restarting Windows.