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ACotGK-seng-Extractor.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <RootNamespace>ACotGK_seng_Extractor</RootNamespace>
+  </PropertyGroup>
+
+</Project>

ACotGK-seng-Extractor.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.34407.143
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ACotGK-seng-Extractor", "ACotGK-seng-Extractor.csproj", "{879F783D-F43F-41E2-B47F-5A7D35CFC70B}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{879F783D-F43F-41E2-B47F-5A7D35CFC70B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{879F783D-F43F-41E2-B47F-5A7D35CFC70B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{879F783D-F43F-41E2-B47F-5A7D35CFC70B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{879F783D-F43F-41E2-B47F-5A7D35CFC70B}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {E148DFAD-0BFD-44C3-A171-4AC9AD3B50A5}
+	EndGlobalSection
+EndGlobal

Program.cs

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+//Written for The Accursed Crown of the Giant King. https://store.steampowered.com/app/1970780/
+using System;
+using System.IO;
+
+namespace ACotGK_seng_Extractor
+{
+    static class Program
+    {
+        public static BinaryReader br;
+
+        static void Main(string[] args)
+        {
+            using FileStream source = File.OpenRead(args[0]);
+            br = new(source);
+            int fileCount = br.ReadInt32();
+
+            System.Collections.Generic.List<SUBFILE> fileTable = new();
+            for (int i = 0; i < fileCount - 1; i++)
+            {
+                br.ReadInt32();
+                string name = NullTerminatedString();
+                if (br.BaseStream.Position < (i + 1) * 0x4C + 0x48)
+                    br.BaseStream.Position = (i + 1) * 0x4C + 0x48;
+
+                fileTable.Add(new SUBFILE
+                {
+                    name = name,
+                    offset = br.ReadInt32(),
+                    size = br.ReadInt32()
+                });
+            }
+            foreach (SUBFILE sub in fileTable)
+            {
+                br.BaseStream.Position = sub.offset;
+                Directory.CreateDirectory(Path.GetDirectoryName(args[0]) + "//" + Path.GetFileNameWithoutExtension(args[0]) + "//" + Path.GetDirectoryName(sub.name));
+                using FileStream FS = File.Create(Path.GetDirectoryName(args[0]) + "//" + Path.GetFileNameWithoutExtension(args[0]) + "//" + sub.name);
+                BinaryWriter bw = new(FS);
+                bw.Write(br.ReadBytes(sub.size));
+                bw.Close();
+            }
+        }
+
+        public struct SUBFILE
+        {
+            public string name;
+            public int offset;
+            public int size;
+        }
+
+        public static string NullTerminatedString()
+        {
+            char[] fileName = Array.Empty<char>();
+            char readchar = (char)1;
+            while (readchar > 0)
+            {
+                readchar = br.ReadChar();
+                Array.Resize(ref fileName, fileName.Length + 1);
+                fileName[^1] = readchar;
+            }
+            Array.Resize(ref fileName, fileName.Length - 1);
+            string name = new(fileName);
+            return name;
+        }
+    }
+}