SIS file extension - Psion software installation
What is sis file? How to open sis files?
File type specification:
An EPOC software installation system file, with a sis file extension, is the method by which programs are distributed for EPOC based Psion and other organizers.
It makes a package of all the installation files, and ensures they are installed in the right places. It also lists them in the Control Panel so they can be uninstalled later.
The sis application installation packages are also used by successor of EPOC system called Symbian.
This sis file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.