Etresoft, thanks for taking the time to reply further.
You're right about the deprecation of the runtime, of course. Filemaker had been threatening to do as much for a decade. Many developers believed it would never happen, but the company went ahead with the canning just after I completed the first version of my app.
So, I shelved it—for public consumption, at least. I continued to use it for my own ends. It runs on the latest versions of Windows and Mac. I use it almost every day.
Later, noting that no one else had produced a similar desktop app in the interim period, I wondered whether I might offer it for little to no cost as a springboard for development in another programming language. If enough people bought into the premise, I hoped I might elicit interest in the proposal via a crowd-sourcing platform.
So, I returned to it; adding a ‘silent’ data saving script that ensured that, should the app fail under a new OS, the raw data written to the last version would be stored on each user’s harddisk.
I’m still not sure exactly what the deprecation means regarding continued use. None of the features added to FM after 18 would appear in the runtime, but that wasn’t an issue, per se. And I still have ‘canary’ runtimes built in Filemaker 5, 6 and 7 that run today. Of course, there’s no guarantee that what has been will continue to be...