Support for APT Packages.lzma and YUM primary.xml.lzma has been added, using LZMA_Alone but adding XZ is easy. aptdeb: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=510526 yumrpm: https://features.opensuse.org/309167 (buggy patch, but) Decompression (preferrably) uses the pyliblzma module, available for all from https://launchpad.net/pyliblzma --anders