ReactOS 0.4.2 发布了，ReactOS是免费的和开源的操作系统，它基于Windows NT架构中反映出来的最佳设计理念。ReactOS完全从零开始编写，它并非基于Linux的系统，并且与UNIX架构没有共同之处。ReactOS项目 的主旨是提供一份与Windows在二进制上兼容的操作系统。这使得Windows应用软件及驱动程序可以像在Windows系统中那样运作。此 外，Windows操作系统的观感也被采用，这样熟悉Windows用户界面的人将能直截了当地使用ReactOS。ReactOS的终极目标是让人们能 把它作为Windows的可选替代品使用，而这无需更换他们所熟悉的软件。
本次发布的一些新特性：
CORE-9448 Implement version build on a dekstop
CORE-10701 Add unxutils to rapps, work in reactos now
CORE-11508 Implement support for post-mortem ("Auto-Execute") debugging
提升：
CORE-6850 Move code that dereferences ConnectionPort into the if(ConnectionPort) block
CORE-10250 taskmgr: Change "Mem Usage" status text
CORE-10533 PATCH: Fix local network resolving
CORE-10558 Changing Russian time zones
CORE-10636 [RAPPS] Add tcc 0.9.26
CORE-10717 Set telnet.exe appear icon in ReactOS
CORE-10740 TRANSLATION: New patch Russian translation for mspaint
CORE-10955 [syssetup] 2nd Stage Network Setup
CORE-10966 [MAGNIFY] Improvement of application strings by adding '&'.
CORE-11005 Add support of ReiserFS
CORE-11022 [TRANSLATIONS] [IERNONCE] Add Chinese and Malay translations.
CORE-11040 Add FFS File System Driver
CORE-11060 Resource-fy cmdutils\comp
CORE-11129 [taskmgr] Create Task dialog fixups
CORE-11145 Replacement for SHIMGVW control button bitmaps
CORE-11151 [shell32] Improve a list view header
CORE-11161 DPRINT fix: should use 'LastKnownGood' instead of 'Default'
CORE-11172 Upgrade WinBtrfs driver to 0.4
CORE-11226 Updating Turkish Translation
CORE-11262 [taskmgr] improvement german: too long string in statusbar
CORE-11278 [netshell] german - add translation, fix layout
CORE-11295 Upgrade ext2 driver to 0.66
CORE-11349 Display a nice ReactOS version desktop watermark
CORE-11364 [user32] appswitch: Set text background the same color as the rectangle
CORE-11391 Remove WS_EX_CLIENTEDGE from Sol and Spider
CORE-11392 [devmgr] [dxdiag] [netshell] Improve russian translation (P 1 / ?)
CORE-11411 TRANSLATION: Russian translation for telnet
CORE-11413 [shell32] Use a proper log off dialog
CORE-11417 [msgina] Icon fix ups
CORE-11424 TRANSLATION: Russian translation for comp
CORE-11425 TRANSLATION: Russian translation for lautus msstyles
CORE-11437 [PATCH] Fix words in newdev
CORE-11439 TRANSLATION: Romanian resources maintenance
CORE-11476 Updating Turkish Translation
CORE-11479 [PATCH] Cleanup & optimization of nonclient.c
CORE-11512 Include taskmgr in the bootcd and in the administrative tools menu
CORE-11534 Update mbedTLS to 2.3.0
CORE-11567 TRANSLATION: Russian translation for rapps
CORE-11606 [acppage] Windows ME is listed the same as Windows 98
CORE-11638 [SHELL32] Add avi file 151
CORE-11655 [hivecls] Add information for RDP files
CORE-11679 [audio.inf] Use a better icon
更多信息，可查看完整改进日志。