One of my arcane specialties is converting ancient DOS-based database programs written in Clipper and FoxPro to modern Windows platforms.
A client just installed a Clipper conversion I did. She’s happy. The app now runs on any version of Windows, including 64-bit.
PS There are still huge numbers of such DOS-based database apps out there, often doing mission critical tasks for large-sized businesses. Even if it was written in 1992.