diff --git a/ArcFormats/elf/ArcAi5Win.cs b/ArcFormats/elf/ArcAi5Win.cs
index 5d6a864c..fa6b7cb7 100644
--- a/ArcFormats/elf/ArcAi5Win.cs
+++ b/ArcFormats/elf/ArcAi5Win.cs
@@ -28,6 +28,7 @@ using System.Collections.Generic;
 using System.ComponentModel.Composition;
 using System.IO;
 using System.Linq;
+using GameRes.Compression;
 using GameRes.Utility;
 
 namespace GameRes.Formats.Elf
@@ -90,6 +91,15 @@ namespace GameRes.Formats.Elf
             return null;
         }
 
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var input = arc.File.CreateStream (entry.Offset, entry.Size);
+            if (entry.Name.EndsWith (".mes", StringComparison.InvariantCultureIgnoreCase)
+                || entry.Name.EndsWith (".lib", StringComparison.InvariantCultureIgnoreCase))
+                return new LzssStream (input);
+            return input;
+        }
+
         internal class IndexReader
         {
             ArcView         m_file;
diff --git a/supported.html b/supported.html
index e6fd073f..143d5704 100644
--- a/supported.html
+++ b/supported.html
@@ -402,6 +402,7 @@ Zettai Meikyuu Grimm<br/>
 </td></tr>
 <tr class="odd"><td>*.mgf</td><td><tt>MalieGF</tt></td><td>Yes</td></tr>
 <tr><td>*.arc</td><td>-</td><td>No</td><td rowspan="2">AI5WIN</td><td rowspan="2">
+Ai no Katachi ~Ecchi na Onna no Ko wa Kirai... Desu ka?~<br/>
 Ai Shimai ~Docchi ni Suru no!!~<br/>
 Ai Shimai Tsubomi...<br/>
 Dorei Kaigo<br/>