Would anybody be so kind to enlighten me with some context?

Way back:

https://web.archive.org/web/20230307111053/https://macintosh...

wow. .sea suffix, haven't thought about that in a long time.

Good old StuffIt. Or well, let's just say old StuffIt.

Once in a while I remember .arj

And .ain which was even better but now seems to be half lost to time (no Wikipedia, just a few links repeating the same fragments of info like http://justsolve.archiveteam.org/wiki/AIN)

Imagine if computing had continued down the path laid by systems like HyperCard

Hypercard is really kind of like the first implementation of HTML5. With applescript instead of javascript.

We're finally getting there. The model of web notebooks look a lot like Hypercard stacks in terms of usability; there's only missing someone packing them in and easy-to-use distribution and sharing environment that does not depend on users installing their own web server.

And if that package includes some reasonable local LLM model, creating simple programs by end users could be even easier than it ever was with Hypercard.

PWAs could have been so good. redbean/llamafile might be the closest, though.