★ WinRAR 使用獨創的壓縮演算。這能比其他在 PC 的壓縮工具還有更高的壓縮 率，特別是針對執行檔、物件程式庫以及大型的文字檔等等。
★ WinRAR 提供選用的壓縮演算以提高多媒體資料的壓縮率。
★ WinRAR 支援超過 9,223,372,036,854,775,807 位元組大小的檔案及壓縮檔， 至於壓縮檔案的數量則沒有限制。
★ WinRAR 提供對 ZIP 壓縮檔完整的支援，也能解 CAB, ARJ, LZH, TAR, GZ, ACE, UUE, BZ2, JAR 壓縮檔的封包。
★ WinRAR 支援 NTFS 檔案加密及資料流。
★ WinRAR 有新的能力及功能，例如滑鼠圖形互動介面、選單及命令列介面。
★ WinRAR 提供建立「結實壓縮」壓縮檔的功能，這可以提昇比一般壓縮法多 10% - 50% 的壓縮率，特別是對壓縮許多小檔案更為顯著。
★ WinRAR 提供使用預設及延伸自解模組，建立及修改自解壓縮檔。
★ WinRAR 提供建立多分割檔案自解檔的能力。
★ WinRAR 提供許多服務功能，如設定密碼、加入壓縮檔及檔案註解。即使壓縮 檔因外力損毀，也能自動修復，也能鎖定壓縮檔避免遭到修改。
認證資訊更可 以提供進一步安全的保證，WinRAR 會記錄最近更新的資訊及壓縮檔名稱。
★ WinRAR 在註解提供支援 ANSI esc-sequence。這可以允許使用彩色的註解， 不需要額外的 ANSI 驅動程式就擁有 ANSI 的功能。
Version 3.91 beta 1
1. This version can decompress 7-Zip archives created with LZMA2 algorithm.
2. Now a password is requested only once when unpacking 7z archives with encrypted file names from context menu. WinRAR 3.90 asked it twice.
3. This version can unpack tar.bz2 archives consisting of several smaller bz2 streams merged together. Previous versions unpacked only the first nested bz2 stream in such composite archive.
4. WinRAR displays CRC32 of files inside of usual .gz (not .tar.gz) archives. Previous versions left this field blank for GZIP files.
5. Bugs fixed:
a) WinRAR 3.90 displayed "Save" button instead of "Open" or "OK" in "Find archive" dialog ("Open archive" command in "File" menu and "Browse..." command in archiving dialog);
b) WinRAR could display incorrect file names when browsing malformed ZIP archives;
c) WinRAR 3.90 failed to decompress LZH archives created with "-lh7-" algorithm;
d) WinRAR 3.90 could fail to delete a part of files after archiving if delete to Recycle Bin was enabled. This bug was present when working in Windows XP, but not in Windows Vista and Windows 7;
e) when unpacking ISO file using WinRAR "Extract files..." command in Explorer context menu, WinRAR could unpack same archived files twice during the same operation. It displayed the overwrite prompt when unpacking files for the second time;
f) hexadecimal search in WinRAR 3.90 "Find" command and console RAR "ih" command failed to find matches if first byte in search string was greater than 127. ]Homepage - http://www.rarlab.com
]Homepage - http://www.rarlab.com
