Definition(en): SelF-eXtracting LHA/LZH compressed files is an archive format for the Commodore 64 and 128 consisting of files compressed in the LHA format and appended to a program to extract them, so that the archive and its extractor is self-contained and no other program needs to be downloaded or installed in order to extract the archive. It is a sucessor of SDA format with an addition of the extractor is cross-compatible between both Commodore platforms (C-64 and C-128).