I've been trying to get the source files (images) out of the goofy application with the dress-up game and shooting gallery that came with the "BOOTLEG" album. I'm not very technically experienced, so I gave up years ago, but maybe someone here has some ideas?
I think Ghidra might have given some incomplete results, I never got far with it. You can extract a lot from "lain_win.exe" with 7zip but I'm not sure what most of it is, some are sound effects which are playable when given an extension, but the rest are a mystery to me, I assume the small ones are scripts and the "big" ones are images, but compressed somehow. I didn't find anything familiar when I opened them with a hex editor.
I believe "lain_mov.dat" turned out to be an ordinary .avi, it's playable in WMP (it's just a compressed version of the anime OP that plays when you "beat" the dress-up game before it resets).
If anyone's got the know-how and interest to take a look at the files, please see https://anonfiles.com/bdVdu9J0u0/bootleg_zip
(46+ MB) and reply to the thread with your opinion. And if you figure anything out, you'll be a little bit of a hero for isolating the classic "dancing lain" that sometimes appears in the site banner, kek.
(RUN AT YOUR OWN RISK - works fine and safe for me but if you don't trust me you can likely find this in six10's pack at >>1106