On: Dungeons and Directories, an exploration game in y...

[kimixa]

There was also Inner Space (1992) [0] - possibly a similar idea, where levels are directories on your computer, and the goal to collect the "icons" (normally executables IIRC) inside.

I remember having it on some demo disk as a kid

[0] https://en.wikipedia.org/wiki/Operation:_Inner_Space