These are FLAC files. You can convert them with ffmpeg in a single command:

for f in *.flac; do ffmpeg -i "${f}" -vn -c:a pcm_s16le -ar 48000 "${f%.*}_flac-to.wav" ; done

I believe that's for Command Prompt or Powershell on Windows. I can't test it since I run Linux. Also, for Lethal Weapon 3, at least one file in there has a 44100Hz sample rate, not 48000Hz. I would double check the file properties for that game on your end since I can't remember. Just adjust that number in the command to reflect the source file sample rate. All the other games should be 48000Hz. Lethal Weapon 3 is different since I had to source some audio from PinMAME instead of M1.

I'm sorry, I didn't see your other question. Yes. Anyone can download the M1 emulator, configure it, and record sound effects and voices as well. These can also be ripped a from the ROMs directly but the BSMT2000 chip does some interpolation to improve the quality of the sound.

M1 is a software emulator, it uses ROM image files. These can be downloaded from each game's IPDB.org page. Unfortunately you will not get anywhere near the fidelity with voices and sound effects. Every sample used for musical instruments uses a much higher rate, thus higher fidelity. And both channels of stereo music are rendered at a sample rate somewhere between 24kHz and 34kHz. Sound effects and voices uses an 8kHz rate which is phone line quality.

That being said, one can easily use the PinSound sound board system to replace these with CD quality 44.1kHz uncompressed files. So many voices in Jurassic Park for example can be filtered from the movie and mastered in much better quality. Custom speech cannot, obviously.

Yeah, what's there is there and there's no way to improve upon it without using "enhancement" software which often makes it sound worse since you're creating new information by guessing. Using sound effect packs is a good resource, also a good idea to find sound effect CD libraries on archive.org from around the same time period since obviously none of these companies recorded their own effects. Or games from the PS2 era or later that may have quality voices by the same actors. Maybe even the original PlayStation or N64, or a PC game.

Very nice. Looks like someone may have combed some royalty free sound libraries and included ones commonly used in R&B. They are even in lossless WAV format.

Rocky and Bullwinkle is not on my list. It does take a lot of time to do these. But, feel free to check out that tutorial video and record the music yourself. That's all I do, nothing fancy.

I took a brief look at the Jurassic Park rail shooter arcade game and Sega CD point and click game. Both have speech but no actual lines from the movie. The best one could hope for there are higher quality sound effects. Not really seeing anything else prior to games for the sequel film, as real time audio in the early 90s was still considered advanced.

Just an update, Tales from the Crypt is giving me some weird emulation issues with M1 (go figure). Am making slow progress. Will have more to report soon.

M1's playback of tracks 9, 14, and 28 are corrupted beyond my ability to correct for them and they won't be included in my release. Fortunately, I don't think any of these tracks are used. At least, I've never heard them playing Tales from the Crypt for many years. All others are 95% accurate. There are minor differences in one or two others where a few select notes are not sustained properly. Those affected tracks I had to modify the ROM for to silence some voices and sound effects.