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, each one switched over when its replacement is proved.
Silverlight has no runtime left. The exit is screen by screen, not a rewrite.
LightSwitch generated your app. The tooling to regenerate it is gone.
Your records are in Notes databases. Getting them out is the job.