[jolmg]

It's not Informix-4GL, is it? If it is, the DB should be available via `dbaccess`. If you don't have that executable to verify, I imagine the binary files are probably of extensions `.4ge` and `.frm`. Then, the DB is likely a directory with the extension `.dbs`, that has a pair of files per table with the extensions `.dat` and `.idx`.

[PreInternet01]

No, it's definitely not Informix, Progress, Magic, or anything else commercially available that I'm aware of, although it does have all the "sure, let's disaggregate a single record across 26 files" hallmarks of a "4G" tool. But there was a lot of vendor-specific crud around at the time...