Comment 3 for bug 602671

Proposal

7zip provides utilities to pack and unpack 7z archives with File Roller and using the Terminal.
Installing 7zip allows File Roller to use the very efficient 7z compression format for packing and unpacking files and directories. Additionally, it provides you with the 7z and 7za commands at the command line.

Complete list of supported formats:
  * Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR
  * Unpacking only: ARJ, CAB, CHM, CPIO, DEB, DMG, HFS, ISO, LZH, LZMA, MSI, NSIS, RAR, RPM, UDF, WIM, XAR and Z.