So there's been a couple threads I've seen asking where stuff is that the GOG installs should have. Why doesn't the game come with a downloadable soundtrack? Why doesn't a map editor show up when it originally came with one? I too asked these questions. Now, some of you may have figured this out, but this is for people who haven't.

If a game doesn't have a soundtrack release, there's a good chance it's hidden in the game files under Music. I found not only New Vegas' music in the folders, but also the complete Fallout 1 and 2 OSTs (sans the licensed music for obvious reasons).

Far Cry 1 and 2 both have accessible map editors when you install them, right there front and center. Unreal Tournament 2004 and Crysis? Hidden in the files. UnrealEd boots up just fine, but apparently the Crysis editor needs some finagling to get working otherwise it crashes. Apparently, you're supposed to edit the 32 bit lines to be 64, and delete the 32 bit folder, but I only just watched a video on it without testing it.

Not every game is going to have these files without some conversion efforts, but I got Arcanum's soundtrack working just fine by copying over the files since they're just MP3s. Same with both Vampire games. You'll have to do some legwork to get them presentable and organized, but I found the easiest way is to just rename the album as [GAME] Soundtrack in the song properties just so it shows up properly, at least in Groove music.

If you found some not obvious things pertaining to this topic, share it. Never know how you can make other lives easier.

I used to rummage a bit in my NOLF CDs, to fetch the theme song that wasn't included on the "In the lounge" bonus CD (seriously, what an awesome game and package ♥). And for some reason, I found a couple of old french songs in there.

My memory is blurry, but I think there was Rina Ketty's J'attendrai, which can be heard in a shack or a cabin with a record player, at some point in the game (correct me if I'm wrong). But what I remember very precisely is finding Edith Piaf's "La goualante du pauvre Jean" in there, and being uttrly baffled (and delighted) by this file's presence.

In the past, that used to be the case in vast majority of cases. Before companies started hiding the music files behind proprietary formats and whatnot and trying to sell the soundtrack separately. Usually just path to the game/sound/music or similar path. Not to mention, that getting the soundtrack directly from the files means you actually get the full complete soundtrack. The official soundtracks usually omit tons of ambient/short tracks. For example, the official Titan Quest + Immortal Throne soundtrack barely has 2 hours, while there are like 4 and a half hours of actual in-game music to listen to if you extract it through the editor.

Either way, when I buy a game, the music is a part of that. It's not excluded for some magical reason. If a game does not have easily accessible music files and I like the soundtrack, I will pirate it with no second thoughts. UT 2004 soundtrack is in absolutely no way hidden. It's just UT2004/Music. As much in plain sight as can be.

Undertale, which has an official OST, does contain the audio files, as .ogg files, in the game files.

However:
* Some tracks are presented differently. For example, "Oh! My true love!" is split up in the game files, but is a continuous track in the OST.
* The game files contain some unused tracks, most notably kingdescription.ogg
* There's a track on the OST that isn't actually in the game
* Also, worth noting that the OST released before the game did.