Windows 10 build 9841 (fbl_release)

6.4.9841.0.fbl_release.140912-1613
	Build of Windows 10
Version number	6.4
Build number	9841
Architecture	x86, x64
Build lab	fbl_release
Compiled on	2014-09-12
Expiration date
Timebomb	2015-04-15 (+215 days)
About dialog

Windows 10 build 9841 is the first officially released and the first publicly available Technical Preview build of Windows 10. This build was first demonstrated on 30 September 2014 by Microsoft at a press conference,^[1] and later released to users who joined the Windows Insider Program the next day. This build was originally released in the American and British variants of English, Brazilian Portuguese, and Simplified Chinese. The German versions were later leaked on 2 July and 19 September 2015 respectively, alongside with the Korean, Japanese, and Traditional Chinese versions on the same day.

Editions and keys[edit | edit source]

Edition / SKU Name	Product key
Core	334NH-RXG76-64THK-C7CKG-D3VPT
Pro	NKJFK-GPHP7-G8C3J-P6JXR-HQRJR
Pro with Windows Media Center (edition upgrade only)	GBFNG-2X3TC-8R27F-RMKYB-JK7QT
Enterprise	PBHCJ-Q2NYD-2PX34-T2TD6-233PK

New features and changes[edit | edit source]

Desktop Control Panel link in Settings has been removed.

Bugs and quirks[edit | edit source]

Windows Media Center[edit | edit source]

Adding Windows Media Center to this build via a purchased Windows 8.1 product key, the system subsequently identifies itself as running "Windows 8.1 Pro with Media Center", along with a warning that the OS has not been activated.^[2]

Window thumbnail border color error[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.