流行好用的压缩工具，支持鼠标拖放及外壳扩展，完美支持 ZIP 档案，内置程序可以解开 CAB、ARJ、LZH、TAR、GZ、ACE、UUE、BZ2、JAR、ISO 等多种类型的压缩文件；具有估计压缩功能，你可以在压缩文件之前得到用 ZIP 和 RAR 两种压缩工具各三种压缩方式下的大概压缩率；具有历史记录和收藏夹功能；压缩率相当高，而资源占用相对较少、固定压缩、多媒体压缩和多卷自释放压缩是大多压缩工具所不具备的；使用非常简单方便，配置选项不多，仅在资源管理器中就可以完成你想做的工作；对于ZIP 和 RAR 的自释放档案文件( DOS 和 WINDOWS 格式均可)，点击属性就可以轻易知道此文件的压缩属性，如果有注释，还能在属性中查看其内容。
Version 3.90 beta 1更新情况
1. WinRAR version for Windows x64 is available. If you use Windows x64, it is strongly recommended to install 64 bit WinRAR version. It provides a higher performance and better shell integration than 32 bit version.
2. RAR compression speed is improved for multi-core and multi-CPU systems. This improvement is most noticeable in Windows Vista and Windows 7 operating systems.
3. "Remove duplicate folders from extraction path" option in "Settings/Compression" dialog is replaced by more universal "Remove redundant folders from extraction path" option. This option will eliminate redundant archive name based folders from extraction path if you unpack an archive with "Extract to DestName\" context menu command and if archive root folder contains only one folder and no files.
4. Changes in "Extraction path and options" dialog:
a) "New folder" button creates a new subfolder in currently selected folder;
b) F2 key renames a selected folder in the folders tree;
c) F5 key updated the tree pane contents;
d) Del key removes a selected folder in the folders tree.
5. You can enable "Show seconds" option in "Settings/File list" dialog if you wish to see seconds in file dates in file list in WinRAR shell.
6. "Where to check for SFX archives" options group in "Settings/Integration/Context menus items" dialog lets you to control processing of SFX archives in context menus. For example, if you frequently right click ".exe" files on slow network disks, you can turn off "Network disks" options to minimize the delay before displaying the context menu.
7. If you sort files by name in the file list in WinRAR shell, WinRAR will use the new logical file name sorting, same as in Windows Explorer, considering digits in file names by their numerical value. So files will be sorted as 1.txt, 2.txt, 10.txt instead of previous 1.txt, 10.txt, 2.txt. This new sort behavior is available in Windows XP Service Pack 2 and newer.
8. Ctrl+W key combination can be used to close the main WinRAR window also as WinRAR viewer windows. "View as Windows text" shortcut in WinRAR viewer changed from Ctrl+W to Ctrl+I.
9. New command line switch -r- disables recursion completely. So 'rar a -r- arc dirname' command will add only the empty dirname folder and ignore its contents. By default, if dirname does not include wildcards, RAR adds its contents even if -r switch is not specified.
10. If used when extracting, the new command line switch -ai forces RAR to ignore file attributes. When using this switch, extracted files will always have attributes assigned by operating system to a newly created file by default.
11. If output file name is not specified in "cw" command, console RAR will send comment data to stdout.
12. When compressing stdin data with -si[name] switch, RAR sets modification time of archived entry to current system time. Previous RAR versions did not fill this field, resulting in meaningless modification time for stdin.
13. Message displayed when you place the mouse cursor on WinRAR tray icon includes the archive name now. Previously only time left and total percent were displayed for archiving operations.
14. Bugs fixed:
a) WinRAR could fail to open tar or tar.gz archive if such archive contained a file larger than 8 GB;
b) WinRAR context menu did not work properly in Windows 7 beta if icons in context menus were enabled and user clicked a file inside of Windows 7 Library folder;
c) previous WinRAR versions failed to rename files having 5 or more continuous spaces in the name. WinRAR shell does not display such spaces for safety reasons, because they can hide an actual file extension. But this security measure prevented the rename command to work properly.
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