gog_kotor_extract_music.sh

#!/bin/bash

# Run from location where you have audio
# from the <game-dir>/streammusic directory

mp3s=(
   [0-5]*.wav
   mus_{a,b,t}*.wav
   evil_ending.wav
   credits.wav
)

wavs=(
   al_*.wav
   mus_loadscreen.wav 
)

mkdir -p fixed

for src in ${mp3s[@]}; do
   target="fixed/${src%%.*}.mp3"
   echo "fixing ${src} -> ${target}"
   dd if=${src} of=${target} ibs=1 skip=58 obs=10M
done

for src in ${wavs[@]}; do
   target="fixed/${src}"
   echo "fixing ${src} -> ${target}"
   dd if=${src} of=${target} ibs=1 skip=470 obs=10M
done

for people with windows you can use this powershell script. Save with .ps1 extension. Set the correct paths. Place the script inside the target "streammusic" folder and run the script.

# Set the working directory to the folder containing the audio files
$sourceDir = "C:\Program Files (x86)\Star Wars Knights of the Old Republic\streammusic"
$fixedDir = "C:\kotor\fix"

# Create the 'fixed' directory if it doesn't exist
if (!(Test-Path -Path $fixedDir)) {
    New-Item -ItemType Directory -Path $fixedDir
}

# Define arrays for MP3 and WAV files
$mp3s = Get-ChildItem -Path $sourceDir -Filter "*.wav" | Where-Object { $_.Name -match "^[0-5]|mus_[abt]|evil_ending|credits" }
$wavs = Get-ChildItem -Path $sourceDir -Filter "*.wav" | Where-Object { $_.Name -match "^al_|mus_loadscreen" }

# Process mp3s (skip 58 bytes)
foreach ($src in $mp3s) {
    $target = "$fixedDir\$($src.BaseName).mp3"
    Write-Output "fixing $($src.Name) -> $($target)"
    $inStream = [System.IO.File]::OpenRead($src.FullName)
    $outStream = [System.IO.File]::Create($target)
    $inStream.Seek(58, 'Begin')
    $inStream.CopyTo($outStream)
    $inStream.Close()
    $outStream.Close()
}

# Process wavs (skip 470 bytes)
foreach ($src in $wavs) {
    $target = "$fixedDir\$($src.Name)"
    Write-Output "fixing $($src.Name) -> $($target)"
    $inStream = [System.IO.File]::OpenRead($src.FullName)
    $outStream = [System.IO.File]::Create($target)
    $inStream.Seek(470, 'Begin')
    $inStream.CopyTo($outStream)
    $inStream.Close()
    $outStream.Close()
}

Nice, that would be useful for those who don't have bash on Windows set up.

Indeed, I was confronted yesterday with this problem. You can take this code and put it somewhere for future kotor fans. I don't know github so well. Or just leave it as a coment.