Does anyone here have experience with Game Extractor?

[StishStash]

I repeat myself. GAME RIPPER scans for assets using magic bytes only, it also automatically adds proper file extensions on export (and what's more saves images as PNG files as well).
Not to mention that it would have chopped off that garbage before the BM header for you automatically.

Good luck finding a tool that can read these. Maybe ffmpeg or mpv worth a try (they are known to support some old and proprietary game formats too).

I don't know what to tell you, man, they just didn't want to show up in the program.

Well, iMUS is definitely some kind of sound file, I can tell by the sheer quantity of them, I can't directly convert them with ffmpeg but I managed to extract them in a somewhat convoluted way (unfortunately they aren't in the best quality), and after looking at the files some more ALSV is basically just some programming to make the tutorial cutscenes play out.

Sadly, the only sprites I can locate are the interface and technically what could be classified as backgrounds, static images. The characters, buildings, and other map elements must be locked away somewhere among the code of the other files. It's gonna be one of THOSE things that's impossible to do without a specialized program...but anyway I should stop posting updates for now.