Comment by bri3d

I worked with a steel warehouse about 10 years ago who were using software written in a Data General Business BASIC offshoot dialect, which ran on a proprietary Windows runtime that was essentially emulating the original minicomputer which ran the software when it was originally written in the late 1970s. Thankfully, the emulator at least ran on Windows so we were able to move it to a hosted environment with backups and away from a random tower in a metal warehouse, which is no place for a computer.

We were also tasked with adding new process automation and tooling. Instead of rewriting the system, we reverse engineered the database format and wrote additional tools and utilities around the core tooling, using more modern frameworks. I think this was the right choice and everyone was happy: they didn't have to relearn years of muscle-memory and business process built around the BASIC system, but we could iterate in a modern programming environment.

It wouldn't be surprising if the system was still in use, there was nothing wrong with it and it worked great.