Meanwhile Win 3.11... Is still running fine on test equipment. The manufacturer says do not upgrade to any other version of Windows.
I have a gang-programming-and-testing production tool from one of the top three (or so) manufacturers of BLE systems-on-a-chip. Our startup needs this (or a suitable alternative) to go into volume production of our initial products.
It comes with an application - in source in a build environment. This allows it to be customized, to add tests for the peripherals added to make the final assembly, and to integrate into production processes and databases.
But the build environment is only supported in Windows 7, 7 Pro, 8, and 8.1, using Visual Studio 2012. The executables and DLLs produced run only on those or XP.
The executable/DLLs use .NET, too, and the way they use it breaks the GUI under wine, even with genuine Microsoft .NET installed. They run correctly, but the status display is corrupted in a way that makes it unusable. So at the production site it needs to run on genuine Windows at one of those levels. B-b
As of the last time I checked (a couple months ago), the manufacturer is unwilling to port to another OS or version - even though all of them (except maybe 7 Pro) have been end-of-lifed by Microsoft.