diff --git a/android/app/src/main/java/io/github/kichikuou/system3/Launcher.kt b/android/app/src/main/java/io/github/kichikuou/system3/Launcher.kt
index 13ca138..27caab6 100644
--- a/android/app/src/main/java/io/github/kichikuou/system3/Launcher.kt
+++ b/android/app/src/main/java/io/github/kichikuou/system3/Launcher.kt
@@ -216,7 +216,7 @@ class Launcher private constructor(private val rootDir: File) {
     // A helper class which generates playlist.txt in the game root directory.
     private class GameConfigWriter {
         private var hasAdisk = false
-        private val audioRegex = """.*?(\d+)\.(wav|mp3|ogg)""".toRegex(RegexOption.IGNORE_CASE)
+        private val audioRegex = """((\d+).*|.*?(\d+))\.(wav|mp3|ogg)""".toRegex(RegexOption.IGNORE_CASE)
         private val audioFiles: Array<String?> = arrayOfNulls(100)
 
         fun maybeAdd(path: String) {
@@ -226,7 +226,7 @@ class Launcher private constructor(private val rootDir: File) {
                 hasAdisk = true
             }
             audioRegex.matchEntire(name)?.let {
-                val track = it.groupValues[1].toInt()
+                val track = it.groupValues[2].toIntOrNull() ?: it.groupValues[3].toInt()
                 if (0 < track && track <= audioFiles.size)
                     audioFiles[track - 1] = path
             }