At my first job they used a programming language that worked on top of c somehow developed by their sister company(used to be the same but split) all that to make a shitty ERP and eh...it was many, many gigabytes partially written by people now retired. I don't think the few images and other such stuff used were part of that (it also had a few random cobol files i encountered) and it had everything from the UI rendering and handling to a webserver i had to communicate with but about which nobody knew how it worked because the guy who made it was enjoying his olden days.

To be totally fair it was the biggest inefficient coding mess I've seen. I still regret not scanning and keeping the customerlist because if I did i'd be deep in that business right now making bank.