Read Instructions Carefully Keka is a free file archiver for Mac OS X the main compression core is p7zip (7-zip port) Compression formats supported: 7z, Zip, Tar, Gzip, Bzip2, DMG, ISO Extraction formats supported: RAR, 7z, Lzma, Zip, Tar, Gzip, Bzip2, ISO, EXE, CAB, PAX, ACE (PPC)