SDA
From Just Solve the File Format Problem
SDA (Self-Dissolving Archive) is an archive format for the Commodore 64 and 128 consisting of files compressed in the Commodore ARC format and appended to a program to extract them (called using a Commodore BASIC SYS command), 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. Versions for the 64 and 128 are different and not compatible with one another. The format was superseded by SFX, which is cross-compatible between both Commodore platforms (C-64 and C-128).
