WinRAR 4.20 官方简体中文正式版发布下载，伴随如下更新和改进：
在WinRAR 4.20 中，RAR和ZIP的压缩都得到改进，其中RAR的常规压缩算法优化，更好利用多核心处理器；另外，RAR的解压算法也有所提升。“查找文件”命令支持7-Zip中的数据，WinRAR和WinRAR自解压模块将不再支持Windows2000操作系统。
WinRAR是一款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。
WinRAR 4.20 正式版 更新内容：
1. Changes in RAR compression:
a) RAR general compression algorithm is optimized for betterutilization of several processor cores. While some speed gain is possible even in single processor mode, best resultsare achieved in multi-core environment.
Speed gain depends on data type and average file size.Several cores are utilized more efficiently when compressinglarge files.
b) we had to increase memory requirements to achieve higher compression speed. General RAR compression algorithm allocates
about 120 MB comparing to 40 MB in WinRAR 4.11;
c) RAR text compression algorithm cannot utilize several CPU cores efficiently, so its performance in multiprocessor environment is much lower than for general algorithm. Also its decompression speed is much lower than in general algorithm regardless of CPU number. So we decided to disable the text algorithm by default.
If you need maximum possible compression ratio for plain text data regardless of speed, you can enable the text compression in "Advanced compression parameter" dialog. Press "Compression..." button on "Advanced" page of archiving dialog to access it.
You can also change this option permanently in default compression profile;
In the command line mode the text compression can be enabled with -mct switch;
d) "Fastest" (-m1) compression mode also supports several processor cores now. In 4.11 it could use only a single processor core.
2. RAR general decompression algorithm speed is slightly improved,though not to same extent as RAR compression. RAR decompression is not able to use several processor cores, so its performance does not depend on a number of cores.
3. Changes in ZIP compression:
a) now ZIP compression supports several processor cores resulting in noticeably higher performance in multi-core environment. Single CPU ZIP compression is also faster than in 4.11;
b) memory use for ZIP compression is increased to about 15 MB.
4. Recovery volume creating and processing can use several CPU cores resulting in higher speed. Though, typically hard drive seek speed is a limiting factor for recovery volumes, so this gain is most noticeable when working with solid state drive.
5. Now the allowed value for -mt switch is 1 - 32, not 0 - 16 as before.
6. "Find files" command can search data in 7-Zip archives.
Previously "Find files" did not support .7z archive format.
7. Windows 2000 is not supported by WinRAR and WinRAR self-extracting modules anymore.
8. "Save current settings" button in "Advanced SFX options" dialog is now available only when converting an existing archive to SFX.
Options saved with this button are applied only to convert to SFX operation.
If you create or update SFX archive, only SFX options stored in default compression profile are used. Options saved in "Advanced SFX options" dialog are ignored for these operations.
运行环境：Windows XP/Vista/Win7等
WinRAR 4.20 官方简体中文正式版32位下载：
（1.6MB）
WinRAR 4.20 官方简体中文正式版64位下载：
（1.7MB）
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