diff --git a/ArcFormats/AudioOGV.cs b/ArcFormats/AudioOGV.cs
index a60ac36d..68ba03e8 100644
--- a/ArcFormats/AudioOGV.cs
+++ b/ArcFormats/AudioOGV.cs
@@ -25,6 +25,7 @@
 
 using System.ComponentModel.Composition;
 using System.IO;
+using GameRes.Utility;
 
 namespace GameRes.Formats.ShiinaRio
 {
@@ -37,21 +38,29 @@ namespace GameRes.Formats.ShiinaRio
         
         public override SoundInput TryOpen (Stream file)
         {
-            var input = file as MemoryStream;
-            if (null == input || !input.CanWrite)
+            file.Position = 0xc;
+            var header = new byte[8];
+            if (8 != file.Read (header, 0, 8))
+                return null;
+            if (!Binary.AsciiEqual (header, 0, "fmt "))
+                return null;
+            uint offset = LittleEndian.ToUInt32 (header, 4);
+            file.Seek (offset, SeekOrigin.Current);
+            if (8 != file.Read (header, 0, 8))
+                return null;
+            if (!Binary.AsciiEqual (header, 0, "data"))
+                return null;
+
+            var input = new StreamRegion (file, file.Position);
+            try
             {
-                input = new MemoryStream();
-                file.CopyTo (input);
+                return new OggInput (input);
+            }
+            catch
+            {
+                input.Dispose();
+                throw;
             }
-            input.Position = 1;
-            input.WriteByte ((byte)'g');
-            input.WriteByte ((byte)'g');
-            input.WriteByte ((byte)'S');
-            input.Position = 0;
-            var ogg = new OggInput (input);
-            if (file != input)
-                file.Dispose();
-            return ogg;
         }
     }
 }
diff --git a/ArcFormats/Properties/AssemblyInfo.cs b/ArcFormats/Properties/AssemblyInfo.cs
index 3a7208ba..451c7186 100644
--- a/ArcFormats/Properties/AssemblyInfo.cs
+++ b/ArcFormats/Properties/AssemblyInfo.cs
@@ -32,5 +32,5 @@ using System.Runtime.InteropServices;
 // You can specify all the values or you can default the Build and Revision Numbers 
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion ("1.0.6.62")]
-[assembly: AssemblyFileVersion ("1.0.6.62")]
+[assembly: AssemblyVersion ("1.0.6.63")]
+[assembly: AssemblyFileVersion ("1.0.6.63")]