In the mid 1990s I was working for a large construction/engineering consultancy. We'd often engage the services of an acoustic consultant who used a wonderful piece of software to convert all manner of weird binary instrumentation files to useful tabular data. As we were stuck using the terrible MS-DOS programs that came with the equipment, we were really impressed by this package. Our company was PC only, so we never got to deploy it for ourselves.
In order of decreasing certainty:
It was a Macintosh System 7 program running on a PowerBook (either 68K or early PowerPC) around 1994-1997
It was probably called Rosetta or Rosetta Stone or similar. Apple's own dynamic binary translator causes rather too much namespace clash for search engines to find it
In addition to a huge array of built-in file format translators, it had a grid-like file viewer that allowed you not merely to select columns, but pick out binary fields and identify record sizes. Once these fields were defined, you could save it as a translator for particular types of data files
It was rather niche, but dedicated users loved it and often got other users by word of mouth. It was Mac only.
Does anyone recognize this package? I've never seen anything like it, before or since. It might now be called a data forensics package.
Packages it wasn't (from answers/comments) — ResEdit, Fortner/Spyglass Transform, Resourcer