7-Zip是一个开源、免费、小巧、强大的数据压缩解压软件。7-Zip可以解压7z, XZ, BZIP2, GZIP, TAR, ZIP, WIM, ARJ, CAB, CHM, CPIO, CramFS, DEB, DMG, FAT, HFS, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, RAR, RPM, SquashFS, UDF, VHD, WIM, XAR, Z等格式压缩文件。
7-Zip 9.30 Alpha是一个开发版本，不要用来操作重要文件和档案，如果需要稳定版本的可以使用7-Zip 9.25alpha或者9.20稳定版。

7-Zip 9.30 Alpha 更新内容：
- The BUG in 7-Zip 9.26 alpha – 9.29 alpha versions was fixed.
These alpha versions could not open non-solid 7z archive, if
some files were skipped during creation of that archive.
That problem is also related to 7z archives created in solid mode,
if each solid block contains no more than one file.
Note: 7-Zip skips files that were open for writing by another
application and shows warning in that case.