diff --git a/Switch_Toolbox_Library/Compression/Formats/LZ77.cs b/Switch_Toolbox_Library/Compression/Formats/LZ77.cs
new file mode 100644
index 00000000..ee9e8767
--- /dev/null
+++ b/Switch_Toolbox_Library/Compression/Formats/LZ77.cs
@@ -0,0 +1,65 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.IO;
+using System.IO.Compression;
+using System.Threading.Tasks;
+using Toolbox.Library.IO;
+using Toolbox.Library.Forms;
+using System.Runtime.InteropServices;
+
+namespace Toolbox.Library
+{
+    public class LZ77 : ICompressionFormat
+    {
+        public string[] Description { get; set; } = new string[] { "LZ77 Compressed" };
+        public string[] Extension { get; set; } = new string[] { "*.lz", };
+
+        bool isType11;
+        public bool Identify(Stream stream, string fileName)
+        {
+            if (stream.Length < 16)
+                return false;
+
+            using (var reader = new FileReader(stream, true))
+            {
+                if(Utils.GetExtension(fileName) == ".lz")
+                {
+                    reader.SeekBegin(12);
+                    isType11 = reader.ReadByte() == 0x11;
+                    return isType11;
+                }
+            }
+            return false;
+        }
+
+        public bool CanCompress { get; } = true;
+
+        private bool UseLZMAMagicHeader = true;
+
+        public Stream Decompress(Stream stream)
+        {
+            using (var reader = new FileReader(stream))
+            {
+                if (isType11)
+                {
+                    uint decomp_size = reader.ReadUInt32();
+
+                    var sub = new SubStream(stream, 16);
+                    return new MemoryStream(LZ77_WII.Decompress11(sub.ToArray(), (int)decomp_size));
+                }
+                else
+                {
+                    return new MemoryStream();
+                }
+            }
+        }
+
+        public Stream Compress(Stream stream)
+        {
+            MemoryStream mem = new MemoryStream();
+
+            return mem;
+        }
+    }
+}
diff --git a/Switch_Toolbox_Library/Toolbox_Library.csproj b/Switch_Toolbox_Library/Toolbox_Library.csproj
index 52eede1a..91152c36 100644
--- a/Switch_Toolbox_Library/Toolbox_Library.csproj
+++ b/Switch_Toolbox_Library/Toolbox_Library.csproj
@@ -232,6 +232,7 @@
     <Compile Include="Compression\Formats\lz4.cs" />
     <Compile Include="Compression\Formats\LZ4F.cs" />
     <Compile Include="Compression\Formats\LZMA.cs" />
+	<Compile Include="Compression\Formats\LZ77.cs" />
     <Compile Include="Compression\Formats\MtaCustomCmp.cs" />
     <Compile Include="Compression\Formats\ZlibGZ.cs" />
     <Compile Include="Compression\Formats\Zstb.cs" />