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ASURA-Dat-Extractor.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>ASURA_Dat_Extractor</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ASURA-Dat-Extractor.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.8.34309.116
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ASURA-Dat-Extractor", "ASURA-Dat-Extractor.csproj", "{0F02F8AF-66B4-4BCD-8CE8-99EC0FA91388}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{0F02F8AF-66B4-4BCD-8CE8-99EC0FA91388}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{0F02F8AF-66B4-4BCD-8CE8-99EC0FA91388}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{0F02F8AF-66B4-4BCD-8CE8-99EC0FA91388}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{0F02F8AF-66B4-4BCD-8CE8-99EC0FA91388}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {B9437036-BE0E-4F28-A7F8-4A87692DCBB9}
+	EndGlobalSection
+EndGlobal

Program.cs

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+//Written for ASURA. https://store.steampowered.com/app/2293900/
+using System.IO.Compression;
+
+FileStream input = File.OpenRead(args[0]);
+BinaryReader br = new(input);
+Directory.CreateDirectory(Path.GetDirectoryName(args[0]) + "\\" + Path.GetFileNameWithoutExtension(args[0]));
+if (new string(br.ReadChars(7)) != "D-PACK2")
+    throw new Exception("Not a ASURA dat file.");
+
+br.ReadByte();
+int fileCount = br.ReadInt32();
+int size = br.ReadInt32();
+
+List<SUBFILE> subfiles = [];
+for (int i = 0; i < fileCount; i++)
+{
+    subfiles.Add(new()
+    {
+        unknown = br.ReadSingle(),
+        start = br.ReadInt32(),
+        sizeUncompressed = br.ReadInt32(),
+        sizeCompressed = br.ReadInt32(),
+        name = i
+    });
+}
+
+foreach (SUBFILE subfile in subfiles)
+{
+    br.BaseStream.Position = subfile.start;
+
+    using FileStream FS = File.Create(Path.GetDirectoryName(args[0]) + "\\" + Path.GetFileNameWithoutExtension(args[0]) + "\\" + subfile.name);
+    BinaryWriter bw = new(FS);
+
+    MemoryStream ms = new();
+    br.ReadInt16();
+    using (var ds = new DeflateStream(new MemoryStream(br.ReadBytes(subfile.sizeCompressed - 2)), CompressionMode.Decompress))
+        ds.CopyTo(ms);
+    br = new(ms);
+    br.BaseStream.Position = 0;
+
+    bw.Write(br.ReadBytes(subfile.sizeUncompressed));
+    bw.Close();
+    br = new(input);
+}
+
+class SUBFILE
+{
+    public float unknown;
+    public int start;
+    public int sizeUncompressed;
+    public int sizeCompressed;
+    public int name;
+}