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SIS files are used in Symbian OS, a mobile operating system that was popular in the early 2000s. SIS files contain installation packages for Symbian applications, including the application's code, resources, and configuration data. These files are typically used for distributing and installing applications on Symbian-based devices.
: If the original SIS file was actually a wrapper for a Java application (rare but possible), the Java files could be extracted and renamed to .jar. : Most users today don't convert the file; they use an sis 2 jar converter