diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index cf3e8ab6..a45bf627 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -106,6 +106,7 @@
     <Compile Include="BlackRainbow\ArcCCF.cs" />
     <Compile Include="BlackRainbow\ArcIMP.cs" />
     <Compile Include="BlackRainbow\ArcSPPAK.cs" />
+    <Compile Include="Bonk\ArcPACK.cs" />
     <Compile Include="Cadath\ArcDAF.cs" />
     <Compile Include="Cadath\ImageCGF.cs" />
     <Compile Include="Cmvs\CpzHeader.cs" />
@@ -1004,9 +1005,6 @@
     </EmbeddedResource>
     <EmbeddedResource Include="Strings\arcStrings.ru-RU.resx" />
   </ItemGroup>
-  <ItemGroup>
-    <Folder Include="Bonk\" />
-  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <PropertyGroup>
     <PreBuildEvent>perl "$(SolutionDir)inc-revision.pl" "$(ProjectPath)" $(ConfigurationName)
diff --git a/ArcFormats/Bonk/ArcPACK.cs b/ArcFormats/Bonk/ArcPACK.cs
new file mode 100644
index 00000000..84681efd
--- /dev/null
+++ b/ArcFormats/Bonk/ArcPACK.cs
@@ -0,0 +1,143 @@
+//! \file       ArcPACK.cs
+//! \date       2018 Jan 04
+//! \brief      Bonk! Game Studio resource archive.
+//
+// Copyright (C) 2018 by morkt
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//
+
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.Globalization;
+using System.IO;
+using System.Linq;
+using GameRes.Compression;
+
+namespace GameRes.Formats.Bonk
+{
+    [Export(typeof(ArchiveFormat))]
+    public class PackOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "PACK/BONK"; } }
+        public override string Description { get { return "Bonk! Game Stduio resource archive"; } }
+        public override uint     Signature { get { return 0; } }
+        public override bool  IsHierarchic { get { return true; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            var index = LookupIndex (file);
+            if (null == index)
+                return null;
+
+            var last_record = index.Last();
+            if (last_record.Offset + last_record.Size > file.MaxOffset)
+                return null;
+            var dir = index.Select (e => e.ToEntry()).ToList();
+            return new ArcFile (file, this, dir);
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var pent = entry as PackedEntry;
+            if (null == pent || !pent.IsPacked && (entry.Size < 16 || !arc.File.View.AsciiEqual (entry.Offset, "SLID")))
+                return base.OpenEntry (arc, entry);
+            if (!pent.IsPacked)
+            {
+                pent.IsPacked = true;
+                pent.UnpackedSize = arc.File.View.ReadUInt32 (entry.Offset+4);
+            }
+            uint packed_size = arc.File.View.ReadUInt32 (entry.Offset+8);
+            int frame_size = arc.File.View.ReadUInt16 (entry.Offset+0xC);
+            var input = arc.File.CreateStream (entry.Offset+0x10, packed_size);
+            var lzss = new LzssStream (input);
+            lzss.Config.FrameSize = frame_size;
+            lzss.Config.FrameInitPos = frame_size - 0x12;
+            return lzss;
+        }
+
+        IEnumerable<IndexRecord> LookupIndex (ArcView file)
+        {
+            var arc_name = Path.GetFileName (file.Name);
+            if (!arc_name.StartsWith ("data_") || !arc_name.EndsWith (".pack"))
+                return null;
+            ArchiveRecord arc_record;
+            if (!FileListMap.Value.TryGetValue (arc_name, out arc_record))
+                return null;
+            if (file.MaxOffset != arc_record.Size)
+                return null;
+            return arc_record.Index;
+        }
+
+        Lazy<Dictionary<string, ArchiveRecord>> FileListMap = new Lazy<Dictionary<string, ArchiveRecord>> (ReadFileList);
+
+        static Dictionary<string, ArchiveRecord> ReadFileList ()
+        {
+            var file_map = new Dictionary<string, ArchiveRecord>();
+            var comma = new char[] {','};
+            List<IndexRecord> current_list = null;
+            FormatCatalog.Instance.ReadFileList ("bonk_ntr_1.lst", line => {
+                var parts = line.Split (comma);
+                if (2 == parts.Length)
+                {
+                    current_list = new List<IndexRecord>();
+                    file_map[parts[0]] = new ArchiveRecord {
+                        Size = long.Parse (parts[1], NumberStyles.HexNumber),
+                        Index = current_list,
+                    };
+                }
+                else if (3 == parts.Length)
+                {
+                    current_list.Add (new IndexRecord {
+                        Name = parts[2],
+                        Offset = long.Parse (parts[0], NumberStyles.HexNumber),
+                        Size   = uint.Parse (parts[1], NumberStyles.HexNumber),
+                    });
+                }
+            });
+            return file_map;
+        }
+    }
+
+    /// <summary>
+    /// Identifies known archive file.
+    /// </summary>
+    internal class ArchiveRecord
+    {
+        public long     Size;
+        public IEnumerable<IndexRecord> Index;
+    }
+
+    internal class IndexRecord
+    {
+        public string   Name;
+        public long     Offset;
+        public uint     Size;
+
+        public Entry ToEntry ()
+        {
+            var entry = FormatCatalog.Instance.Create<PackedEntry> (Name);
+            entry.Offset = Offset;
+            entry.Size = Size;
+            return entry;
+        }
+    }
+}