diff --git a/ArcFormats/ArcFormats.csproj b/ArcFormats/ArcFormats.csproj
index 27a926e2..f6e665f5 100644
--- a/ArcFormats/ArcFormats.csproj
+++ b/ArcFormats/ArcFormats.csproj
@@ -99,6 +99,7 @@
+
diff --git a/ArcFormats/ExHibit/ArcGRP.cs b/ArcFormats/ExHibit/ArcGRP.cs
new file mode 100644
index 00000000..bc2d9ea1
--- /dev/null
+++ b/ArcFormats/ExHibit/ArcGRP.cs
@@ -0,0 +1,129 @@
+//! \file ArcGRP.cs
+//! \date Thu Apr 06 16:41:59 2017
+//! \brief ExHIBIT audio resource archive.
+//
+// Copyright (C) 2017 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.Text;
+using System.Text.RegularExpressions;
+
+namespace GameRes.Formats.ExHibit
+{
+ [Export(typeof(ArchiveFormat))]
+ public class GrpOpener : ArchiveFormat
+ {
+ public override string Tag { get { return "GRP/EXHIBIT"; } }
+ public override string Description { get { return "ExHIBIT engine audio resource archive"; } }
+ public override uint Signature { get { return 0; } }
+ public override bool IsHierarchic { get { return false; } }
+ public override bool CanWrite { get { return false; } }
+
+ static readonly Regex s_ResNameRe = new Regex (@"res(\d+)\.grp$", RegexOptions.IgnoreCase);
+
+ public override ArcFile TryOpen (ArcView file)
+ {
+ var match = s_ResNameRe.Match (file.Name);
+ if (!match.Success || file.View.AsciiEqual (0, "AiFS"))
+ return null;
+
+ var digits = match.Groups[1];
+ int arc_num = UInt16.Parse (digits.Value);
+ int toc_num = arc_num - 1;
+ int arc_index = 1; // number by which archive is referenced within toc file
+
+ // look for toc file
+ ArcView toc_file = null;
+ var toc_name_sb = new StringBuilder (file.Name.Length);
+ while (toc_num >= 0)
+ {
+ toc_name_sb.Clear();
+ toc_name_sb.Append (file.Name);
+ toc_name_sb.Remove (digits.Index, digits.Length);
+ toc_name_sb.Insert (digits.Index, toc_num.ToString ("D4"));
+ var toc_name = toc_name_sb.ToString();
+ if (!VFS.FileExists (toc_name))
+ return null;
+ toc_file = VFS.OpenView (toc_name);
+ if (toc_file.View.AsciiEqual (0, "AiFS"))
+ break;
+ toc_file.Dispose();
+ toc_file = null;
+ toc_num--;
+ arc_index++;
+ }
+ if (null == toc_file)
+ return null;
+ using (toc_file)
+ {
+ int res_count = toc_file.View.ReadInt32 (0xC);
+ if (res_count < arc_index)
+ return null;
+ uint index_offset = 0x10;
+ // find archive reference within toc file
+ bool arc_found = false;
+ for (int i = 0; i < res_count && index_offset < toc_file.MaxOffset; ++i)
+ {
+ if (toc_file.View.ReadInt32 (index_offset) == arc_index)
+ {
+ arc_found = true;
+ break;
+ }
+ uint entries = toc_file.View.ReadUInt32 (index_offset+0xC);
+ index_offset += 0x10 + entries * 8;
+ }
+ if (!arc_found)
+ return null;
+ int count = toc_file.View.ReadInt32 (index_offset+0xC);
+ if (!IsSaneCount (count))
+ return null;
+ int start_index = toc_file.View.ReadInt32 (index_offset+4);
+ index_offset += 0x10;
+ var dir = new List (count);
+ for (int i = 0; i < count; ++i)
+ {
+ uint offset = toc_file.View.ReadUInt32 (index_offset);
+ uint size = toc_file.View.ReadUInt32 (index_offset+4);
+ if (size != 0)
+ {
+ var entry = new Entry {
+ Name = string.Format ("{0:D5}.ogg", start_index+i),
+ Type = "audio",
+ Offset = offset,
+ Size = size,
+ };
+ entry.Offset = toc_file.View.ReadUInt32 (index_offset);
+ if (!entry.CheckPlacement (file.MaxOffset))
+ return null;
+ dir.Add (entry);
+ }
+ index_offset += 8;
+ }
+ if (0 == dir.Count)
+ return null;
+ return new ArcFile (file, this, dir);
+ }
+ }
+ }
+}