Package Format
Autopackage packages are indicated by the .package extension. They are executable bash scripts, and can be installed by running them. Files in an Autopackage archive are not easily extracted by anything other than Autopackage itself as the internal format must be parsed in order to determine file layout and other issues.
Autopackage programs are installed to hard-coded system paths, which may conflict with existing packages installed by other means, thus leading to corruption. This can usually be remedied by uninstalling an older version of a package being installed with Autopackage.
The Autopackage files can also be installed and removed using the Listaller toolset. Listaller simply includes the Autopackage packages into its own package container format and handles Autopackage like any other Listaller package file.
Read more about this topic: Autopackage