Visual FoxPro 9 left extended support in January 2015 and it was the last version. It is still holding data in publishing, accounting and small manufacturing shops, usually in the same building as the one person who knows how to open it.
I moved a chart-data publisher's FoxPro archive and book-generation tools onto Azure SQL, and kept the FoxPro tools running against the new database until their replacements were ready. The data comes out first; the tools follow.
Your Silverlight app has no browser to run in. The code still says what it does.
LightSwitch generated your app. You cannot regenerate it, but you can read it.
Delphi is alive. Your Delphi 5 codebase, on components that no longer compile, is not.
Your records are in Notes databases. Someone has to read the Notes data model to get them out.