diff --git a/OpenSim/Framework/SLUtil.cs b/OpenSim/Framework/SLUtil.cs
index db4541ef1a..537de7ab15 100644
--- a/OpenSim/Framework/SLUtil.cs
+++ b/OpenSim/Framework/SLUtil.cs
@@ -38,239 +38,189 @@ namespace OpenSim.Framework
     public static class SLUtil
     {
 //        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
-        
+
         #region SL / file extension / content-type conversions
 
+        private class TypeMapping
+        {
+            private sbyte assetType;
+            private InventoryType inventoryType;
+            private string contentType;
+            private string contentType2;
+            private string extension;
+
+            public sbyte AssetTypeCode
+            {
+                get { return assetType; }
+            }
+
+            public object AssetType
+            {
+                get {
+                    if (Enum.IsDefined(typeof(OpenMetaverse.AssetType), assetType))
+                        return (OpenMetaverse.AssetType)assetType;
+                    else
+                        return OpenMetaverse.AssetType.Unknown;
+                }
+            }
+
+            public InventoryType InventoryType
+            {
+                get { return inventoryType; }
+            }
+
+            public string ContentType
+            {
+                get { return contentType; }
+            }
+
+            public string ContentType2
+            {
+                get { return contentType2; }
+            }
+
+            public string Extension
+            {
+                get { return extension; }
+            }
+
+            private TypeMapping(sbyte assetType, InventoryType inventoryType, string contentType, string contentType2, string extension)
+            {
+                this.assetType = assetType;
+                this.inventoryType = inventoryType;
+                this.contentType = contentType;
+                this.contentType2 = contentType2;
+                this.extension = extension;
+            }
+
+            public TypeMapping(AssetType assetType, InventoryType inventoryType, string contentType, string contentType2, string extension)
+                : this((sbyte)assetType, inventoryType, contentType, contentType2, extension)
+            {
+            }
+
+            public TypeMapping(AssetType assetType, InventoryType inventoryType, string contentType, string extension)
+                : this((sbyte)assetType, inventoryType, contentType, null, extension)
+            {
+            }
+        }
+
+        /// <summary>
+        /// Maps between AssetType, InventoryType and Content-Type.
+        /// Where more than one possibility exists, the first one takes precedence. E.g.:
+        ///   AssetType "AssetType.Texture" -> Content-Type "image-xj2c"
+        ///   Content-Type "image/x-j2c" -> InventoryType "InventoryType.Texture"
+        /// </summary>
+        private static TypeMapping[] MAPPINGS = new TypeMapping[] {
+            new TypeMapping(AssetType.Unknown, InventoryType.Unknown, "application/octet-stream", "bin"),
+            new TypeMapping(AssetType.Texture, InventoryType.Texture, "image/x-j2c", "image/jp2", "j2c"),
+            new TypeMapping(AssetType.Texture, InventoryType.Snapshot, "image/x-j2c", "image/jp2", "j2c"),
+            new TypeMapping(AssetType.TextureTGA, InventoryType.Texture, "image/tga", "tga"),
+            new TypeMapping(AssetType.ImageTGA, InventoryType.Texture, "image/tga", "tga"),
+            new TypeMapping(AssetType.ImageJPEG, InventoryType.Texture, "image/jpeg", "jpg"),
+            new TypeMapping(AssetType.Sound, InventoryType.Sound, "audio/ogg", "application/ogg", "ogg"),
+            new TypeMapping(AssetType.SoundWAV, InventoryType.Sound, "audio/x-wav", "wav"),
+            new TypeMapping(AssetType.CallingCard, InventoryType.CallingCard, "application/vnd.ll.callingcard", "application/x-metaverse-callingcard", "callingcard"),
+            new TypeMapping(AssetType.Landmark, InventoryType.Landmark, "application/vnd.ll.landmark", "application/x-metaverse-landmark", "landmark"),
+            new TypeMapping(AssetType.Clothing, InventoryType.Wearable, "application/vnd.ll.clothing", "application/x-metaverse-clothing", "clothing"),
+            new TypeMapping(AssetType.Object, InventoryType.Object, "application/vnd.ll.primitive", "application/x-metaverse-primitive", "primitive"),
+            new TypeMapping(AssetType.Object, InventoryType.Attachment, "application/vnd.ll.primitive", "application/x-metaverse-primitive", "primitive"),
+            new TypeMapping(AssetType.Notecard, InventoryType.Notecard, "application/vnd.ll.notecard", "application/x-metaverse-notecard", "notecard"),
+            new TypeMapping(AssetType.Folder, InventoryType.Folder, "application/vnd.ll.folder", "folder"),
+            new TypeMapping(AssetType.RootFolder, InventoryType.RootCategory, "application/vnd.ll.rootfolder", "rootfolder"),
+            new TypeMapping(AssetType.LSLText, InventoryType.LSL, "application/vnd.ll.lsltext", "application/x-metaverse-lsl", "lsl"),
+            new TypeMapping(AssetType.LSLBytecode, InventoryType.LSL, "application/vnd.ll.lslbyte", "application/x-metaverse-lso", "lso"),
+            new TypeMapping(AssetType.Bodypart, InventoryType.Wearable, "application/vnd.ll.bodypart", "application/x-metaverse-bodypart", "bodypart"),
+            new TypeMapping(AssetType.TrashFolder, InventoryType.Folder, "application/vnd.ll.trashfolder", "trashfolder"),
+            new TypeMapping(AssetType.SnapshotFolder, InventoryType.Folder, "application/vnd.ll.snapshotfolder", "snapshotfolder"),
+            new TypeMapping(AssetType.LostAndFoundFolder, InventoryType.Folder, "application/vnd.ll.lostandfoundfolder", "lostandfoundfolder"),
+            new TypeMapping(AssetType.Animation, InventoryType.Animation, "application/vnd.ll.animation", "application/x-metaverse-animation", "animation"),
+            new TypeMapping(AssetType.Gesture, InventoryType.Gesture, "application/vnd.ll.gesture", "application/x-metaverse-gesture", "gesture"),
+            new TypeMapping(AssetType.Simstate, InventoryType.Snapshot, "application/x-metaverse-simstate", "simstate"),
+            new TypeMapping(AssetType.FavoriteFolder, InventoryType.Unknown, "application/vnd.ll.favoritefolder", "favoritefolder"),
+            new TypeMapping(AssetType.Link, InventoryType.Unknown, "application/vnd.ll.link", "link"),
+            new TypeMapping(AssetType.LinkFolder, InventoryType.Unknown, "application/vnd.ll.linkfolder", "linkfolder"),
+            new TypeMapping(AssetType.CurrentOutfitFolder, InventoryType.Unknown, "application/vnd.ll.currentoutfitfolder", "currentoutfitfolder"),
+            new TypeMapping(AssetType.OutfitFolder, InventoryType.Unknown, "application/vnd.ll.outfitfolder", "outfitfolder"),
+            new TypeMapping(AssetType.MyOutfitsFolder, InventoryType.Unknown, "application/vnd.ll.myoutfitsfolder", "myoutfitsfolder"),
+            new TypeMapping(AssetType.Mesh, InventoryType.Mesh, "application/vnd.ll.mesh", "llm")
+        };
+
+        private static Dictionary<sbyte, string> asset2Content;
+        private static Dictionary<sbyte, string> asset2Extension;
+        private static Dictionary<InventoryType, string> inventory2Content;
+        private static Dictionary<string, sbyte> content2Asset;
+        private static Dictionary<string, InventoryType> content2Inventory;
+
+        static SLUtil()
+        {
+            asset2Content = new Dictionary<sbyte, string>();
+            asset2Extension = new Dictionary<sbyte, string>();
+            inventory2Content = new Dictionary<InventoryType, string>();
+            content2Asset = new Dictionary<string, sbyte>();
+            content2Inventory = new Dictionary<string, InventoryType>();
+            
+            foreach (TypeMapping mapping in MAPPINGS)
+            {
+                sbyte assetType = mapping.AssetTypeCode;
+                if (!asset2Content.ContainsKey(assetType))
+                    asset2Content.Add(assetType, mapping.ContentType);
+                if (!asset2Extension.ContainsKey(assetType))
+                    asset2Extension.Add(assetType, mapping.Extension);
+                if (!inventory2Content.ContainsKey(mapping.InventoryType))
+                    inventory2Content.Add(mapping.InventoryType, mapping.ContentType);
+                if (!content2Asset.ContainsKey(mapping.ContentType))
+                    content2Asset.Add(mapping.ContentType, assetType);
+                if (!content2Inventory.ContainsKey(mapping.ContentType))
+                    content2Inventory.Add(mapping.ContentType, mapping.InventoryType);
+
+                if (mapping.ContentType2 != null)
+                {
+                    if (!content2Asset.ContainsKey(mapping.ContentType2))
+                        content2Asset.Add(mapping.ContentType2, assetType);
+                    if (!content2Inventory.ContainsKey(mapping.ContentType2))
+                        content2Inventory.Add(mapping.ContentType2, mapping.InventoryType);
+                }
+            }
+        }
+        
         public static string SLAssetTypeToContentType(int assetType)
         {
-            switch ((AssetType)assetType)
-            {
-                case AssetType.Texture:
-                    return "image/x-j2c";
-                case AssetType.Sound:
-                    return "audio/ogg";
-                case AssetType.CallingCard:
-                    return "application/vnd.ll.callingcard";
-                case AssetType.Landmark:
-                    return "application/vnd.ll.landmark";
-                case AssetType.Clothing:
-                    return "application/vnd.ll.clothing";
-                case AssetType.Object:
-                    return "application/vnd.ll.primitive";
-                case AssetType.Notecard:
-                    return "application/vnd.ll.notecard";
-                case AssetType.Folder:
-                    return "application/vnd.ll.folder";
-                case AssetType.RootFolder:
-                    return "application/vnd.ll.rootfolder";
-                case AssetType.LSLText:
-                    return "application/vnd.ll.lsltext";
-                case AssetType.LSLBytecode:
-                    return "application/vnd.ll.lslbyte";
-                case AssetType.TextureTGA:
-                case AssetType.ImageTGA:
-                    return "image/tga";
-                case AssetType.Bodypart:
-                    return "application/vnd.ll.bodypart";
-                case AssetType.TrashFolder:
-                    return "application/vnd.ll.trashfolder";
-                case AssetType.SnapshotFolder:
-                    return "application/vnd.ll.snapshotfolder";
-                case AssetType.LostAndFoundFolder:
-                    return "application/vnd.ll.lostandfoundfolder";
-                case AssetType.SoundWAV:
-                    return "audio/x-wav";
-                case AssetType.ImageJPEG:
-                    return "image/jpeg";
-                case AssetType.Animation:
-                    return "application/vnd.ll.animation";
-                case AssetType.Gesture:
-                    return "application/vnd.ll.gesture";
-                case AssetType.Simstate:
-                    return "application/x-metaverse-simstate";
-                case AssetType.FavoriteFolder:
-                    return "application/vnd.ll.favoritefolder";
-                case AssetType.Link:
-                    return "application/vnd.ll.link";
-                case AssetType.LinkFolder:
-                    return "application/vnd.ll.linkfolder";
-                case AssetType.CurrentOutfitFolder:
-                    return "application/vnd.ll.currentoutfitfolder";
-                case AssetType.OutfitFolder:
-                    return "application/vnd.ll.outfitfolder";
-                case AssetType.MyOutfitsFolder:
-                    return "application/vnd.ll.myoutfitsfolder";
-                case AssetType.Unknown:
-                default:
-                    return "application/octet-stream";
-            }
+            string contentType;
+            if (!asset2Content.TryGetValue((sbyte)assetType, out contentType))
+                contentType = asset2Content[(sbyte)AssetType.Unknown];
+            return contentType;
         }
 
         public static string SLInvTypeToContentType(int invType)
         {
-            switch ((InventoryType)invType)
-            {
-                case InventoryType.Animation:
-                    return "application/vnd.ll.animation";
-                case InventoryType.CallingCard:
-                    return "application/vnd.ll.callingcard";
-                case InventoryType.Folder:
-                    return "application/vnd.ll.folder";
-                case InventoryType.Gesture:
-                    return "application/vnd.ll.gesture";
-                case InventoryType.Landmark:
-                    return "application/vnd.ll.landmark";
-                case InventoryType.LSL:
-                    return "application/vnd.ll.lsltext";
-                case InventoryType.Notecard:
-                    return "application/vnd.ll.notecard";
-                case InventoryType.Attachment:
-                case InventoryType.Object:
-                    return "application/vnd.ll.primitive";
-                case InventoryType.Sound:
-                    return "audio/ogg";
-                case InventoryType.Snapshot:
-                case InventoryType.Texture:
-                    return "image/x-j2c";
-                case InventoryType.Wearable:
-                    return "application/vnd.ll.clothing";
-                default:
-                    return "application/octet-stream";
-            }
+            string contentType;
+            if (!inventory2Content.TryGetValue((InventoryType)invType, out contentType))
+                contentType = inventory2Content[InventoryType.Unknown];
+            return contentType;
         }
 
         public static sbyte ContentTypeToSLAssetType(string contentType)
         {
-            switch (contentType)
-            {
-                case "image/x-j2c":
-                case "image/jp2":
-                    return (sbyte)AssetType.Texture;
-                case "application/ogg":
-                case "audio/ogg":
-                    return (sbyte)AssetType.Sound;
-                case "application/vnd.ll.callingcard":
-                case "application/x-metaverse-callingcard":
-                    return (sbyte)AssetType.CallingCard;
-                case "application/vnd.ll.landmark":
-                case "application/x-metaverse-landmark":
-                    return (sbyte)AssetType.Landmark;
-                case "application/vnd.ll.clothing":
-                case "application/x-metaverse-clothing":
-                    return (sbyte)AssetType.Clothing;
-                case "application/vnd.ll.primitive":
-                case "application/x-metaverse-primitive":
-                    return (sbyte)AssetType.Object;
-                case "application/vnd.ll.notecard":
-                case "application/x-metaverse-notecard":
-                    return (sbyte)AssetType.Notecard;
-                case "application/vnd.ll.folder":
-                    return (sbyte)AssetType.Folder;
-                case "application/vnd.ll.rootfolder":
-                    return (sbyte)AssetType.RootFolder;
-                case "application/vnd.ll.lsltext":
-                case "application/x-metaverse-lsl":
-                    return (sbyte)AssetType.LSLText;
-                case "application/vnd.ll.lslbyte":
-                case "application/x-metaverse-lso":
-                    return (sbyte)AssetType.LSLBytecode;
-                case "image/tga":
-                    // Note that AssetType.TextureTGA will be converted to AssetType.ImageTGA
-                    return (sbyte)AssetType.ImageTGA;
-                case "application/vnd.ll.bodypart":
-                case "application/x-metaverse-bodypart":
-                    return (sbyte)AssetType.Bodypart;
-                case "application/vnd.ll.trashfolder":
-                    return (sbyte)AssetType.TrashFolder;
-                case "application/vnd.ll.snapshotfolder":
-                    return (sbyte)AssetType.SnapshotFolder;
-                case "application/vnd.ll.lostandfoundfolder":
-                    return (sbyte)AssetType.LostAndFoundFolder;
-                case "audio/x-wav":
-                    return (sbyte)AssetType.SoundWAV;
-                case "image/jpeg":
-                    return (sbyte)AssetType.ImageJPEG;
-                case "application/vnd.ll.animation":
-                case "application/x-metaverse-animation":
-                    return (sbyte)AssetType.Animation;
-                case "application/vnd.ll.gesture":
-                case "application/x-metaverse-gesture":
-                    return (sbyte)AssetType.Gesture;
-                case "application/x-metaverse-simstate":
-                    return (sbyte)AssetType.Simstate;
-                case "application/vnd.ll.favoritefolder":
-                    return (sbyte)AssetType.FavoriteFolder;
-                case "application/vnd.ll.link":
-                    return (sbyte)AssetType.Link;
-                case "application/vnd.ll.linkfolder":
-                    return (sbyte)AssetType.LinkFolder;
-                case "application/vnd.ll.currentoutfitfolder":
-                    return (sbyte)AssetType.CurrentOutfitFolder;
-                case "application/vnd.ll.outfitfolder":
-                    return (sbyte)AssetType.OutfitFolder;
-                case "application/vnd.ll.myoutfitsfolder":
-                    return (sbyte)AssetType.MyOutfitsFolder;
-                case "application/octet-stream":
-                default:
-                    return (sbyte)AssetType.Unknown;
-            }
+            sbyte assetType;
+            if (!content2Asset.TryGetValue(contentType, out assetType))
+                assetType = (sbyte)AssetType.Unknown;
+            return (sbyte)assetType;
         }
 
         public static sbyte ContentTypeToSLInvType(string contentType)
         {
-            switch (contentType)
-            {
-                case "image/x-j2c":
-                case "image/jp2":
-                case "image/tga":
-                case "image/jpeg":
-                    return (sbyte)InventoryType.Texture;
-                case "application/ogg":
-                case "audio/ogg":
-                case "audio/x-wav":
-                    return (sbyte)InventoryType.Sound;
-                case "application/vnd.ll.callingcard":
-                case "application/x-metaverse-callingcard":
-                    return (sbyte)InventoryType.CallingCard;
-                case "application/vnd.ll.landmark":
-                case "application/x-metaverse-landmark":
-                    return (sbyte)InventoryType.Landmark;
-                case "application/vnd.ll.clothing":
-                case "application/x-metaverse-clothing":
-                case "application/vnd.ll.bodypart":
-                case "application/x-metaverse-bodypart":
-                    return (sbyte)InventoryType.Wearable;
-                case "application/vnd.ll.primitive":
-                case "application/x-metaverse-primitive":
-                    return (sbyte)InventoryType.Object;
-                case "application/vnd.ll.notecard":
-                case "application/x-metaverse-notecard":
-                    return (sbyte)InventoryType.Notecard;
-                case "application/vnd.ll.folder":
-                    return (sbyte)InventoryType.Folder;
-                case "application/vnd.ll.rootfolder":
-                    return (sbyte)InventoryType.RootCategory;
-                case "application/vnd.ll.lsltext":
-                case "application/x-metaverse-lsl":
-                case "application/vnd.ll.lslbyte":
-                case "application/x-metaverse-lso":
-                    return (sbyte)InventoryType.LSL;
-                case "application/vnd.ll.trashfolder":
-                case "application/vnd.ll.snapshotfolder":
-                case "application/vnd.ll.lostandfoundfolder":
-                    return (sbyte)InventoryType.Folder;
-                case "application/vnd.ll.animation":
-                case "application/x-metaverse-animation":
-                    return (sbyte)InventoryType.Animation;
-                case "application/vnd.ll.gesture":
-                case "application/x-metaverse-gesture":
-                    return (sbyte)InventoryType.Gesture;
-                case "application/x-metaverse-simstate":
-                    return (sbyte)InventoryType.Snapshot;
-                case "application/octet-stream":
-                default:
-                    return (sbyte)InventoryType.Unknown;
-            }
+            InventoryType invType;
+            if (!content2Inventory.TryGetValue(contentType, out invType))
+                invType = InventoryType.Unknown;
+            return (sbyte)invType;
+        }
+
+        public static string SLAssetTypeToExtension(int assetType)
+        {
+            string extension;
+            if (!asset2Extension.TryGetValue((sbyte)assetType, out extension))
+                extension = asset2Extension[(sbyte)AssetType.Unknown];
+            return extension;
         }
 
         #endregion SL / file extension / content-type conversions
@@ -377,4 +327,4 @@ namespace OpenSim.Framework
             return output;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/OpenSim/Framework/Tests/UtilTest.cs b/OpenSim/Framework/Tests/UtilTest.cs
index 1ca35dfcb5..f0d2a3f7a7 100644
--- a/OpenSim/Framework/Tests/UtilTest.cs
+++ b/OpenSim/Framework/Tests/UtilTest.cs
@@ -214,16 +214,13 @@ namespace OpenSim.Framework.Tests
 
             for (int i = 0; i < contenttypes.Length; i++)
             {
-                if (SLUtil.ContentTypeToSLAssetType(contenttypes[i]) == 18)
-                {
-                    Assert.That(contenttypes[i] == "image/tga");
-                }
+                int expected;
+                if (contenttypes[i] == "image/tga")
+                    expected = 12;  // if we know only the content-type "image/tga", then we assume the asset type is TextureTGA; not ImageTGA
                 else
-                {
-                    Assert.That(SLUtil.ContentTypeToSLAssetType(contenttypes[i]) == assettypes[i],
-                                "Expecting {0} but got {1}", assettypes[i],
-                                SLUtil.ContentTypeToSLAssetType(contenttypes[i]));
-                }
+                    expected = assettypes[i];
+                Assert.AreEqual(expected, SLUtil.ContentTypeToSLAssetType(contenttypes[i]),
+                            String.Format("Incorrect AssetType mapped from Content-Type {0}", contenttypes[i]));
             }
 
             int[] inventorytypes = new int[] {-1,0,1,2,3,6,7,8,9,10,15,17,18,20};
@@ -237,7 +234,7 @@ namespace OpenSim.Framework.Tests
                                                "application/vnd.ll.primitive",
                                                "application/vnd.ll.notecard",
                                                "application/vnd.ll.folder",
-                                               "application/octet-stream",
+                                               "application/vnd.ll.rootfolder",
                                                "application/vnd.ll.lsltext",
                                                "image/x-j2c",
                                                "application/vnd.ll.primitive",
@@ -247,7 +244,8 @@ namespace OpenSim.Framework.Tests
         
             for (int i=0;i<inventorytypes.Length;i++)
             {
-                Assert.That(SLUtil.SLInvTypeToContentType(inventorytypes[i]) == invcontenttypes[i], "Expected {0}, Got {1}", invcontenttypes[i], SLUtil.SLInvTypeToContentType(inventorytypes[i]));
+                Assert.AreEqual(invcontenttypes[i], SLUtil.SLInvTypeToContentType(inventorytypes[i]),
+                    String.Format("Incorrect Content-Type mapped from InventoryType {0}", inventorytypes[i]));
             }
 
             invcontenttypes = new string[]
@@ -280,7 +278,8 @@ namespace OpenSim.Framework.Tests
 
             for (int i = 0; i < invtypes.Length; i++)
             {
-                Assert.That(SLUtil.ContentTypeToSLInvType(invcontenttypes[i]) == invtypes[i], "Expected {0}, Got {1}", invtypes[i], SLUtil.ContentTypeToSLInvType(invcontenttypes[i]));
+                Assert.AreEqual(invtypes[i], SLUtil.ContentTypeToSLInvType(invcontenttypes[i]),
+                    String.Format("Incorrect InventoryType mapped from Content-Type {0}", invcontenttypes[i]));
             }
         }
     }