diff --git a/OpenSim/Region/CoreModules/Avatar/Inventory/Archiver/InventoryArchiveReadRequest.cs b/OpenSim/Region/CoreModules/Avatar/Inventory/Archiver/InventoryArchiveReadRequest.cs
index 1e21b743bf..47a47cc107 100644
--- a/OpenSim/Region/CoreModules/Avatar/Inventory/Archiver/InventoryArchiveReadRequest.cs
+++ b/OpenSim/Region/CoreModules/Avatar/Inventory/Archiver/InventoryArchiveReadRequest.cs
@@ -502,10 +502,10 @@ namespace OpenSim.Region.CoreModules.Avatar.Inventory.Archiver
         {
             //IRegionSerialiser serialiser = scene.RequestModuleInterface<IRegionSerialiser>();
             // Right now we're nastily obtaining the UUID from the filename
-            string filename = assetPath.Remove(0, ArchiveConstants.ASSETS_PATH.Length);
-            int i = filename.LastIndexOf(ArchiveConstants.ASSET_EXTENSION_SEPARATOR);
+            string filename = assetPath[ArchiveConstants.ASSETS_PATH.Length..];
+            int indx = filename.LastIndexOf(ArchiveConstants.ASSET_EXTENSION_SEPARATOR);
 
-            if (i == -1)
+            if (indx < 32)
             {
                 m_log.ErrorFormat(
                    "[INVENTORY ARCHIVER]: Could not find extension information in asset path {0} since it's missing the separator {1}.  Skipping",
@@ -514,11 +514,8 @@ namespace OpenSim.Region.CoreModules.Avatar.Inventory.Archiver
                 return false;
             }
 
-            string extension = filename.Substring(i);
-            string rawUuid = filename.Remove(filename.Length - extension.Length);
-            UUID assetId = new UUID(rawUuid);
-
-            if (!ArchiveConstants.EXTENSION_TO_ASSET_TYPE.ContainsKey(extension))
+            string extension = filename[indx..];
+            if (!ArchiveConstants.EXTENSION_TO_ASSET_TYPE.TryGetValue(extension, out sbyte assetType))
             {
                 m_log.ErrorFormat(
                    "[INVENTORY ARCHIVER]: Tried to dearchive data with path {0} with an unknown type extension {1}",
@@ -526,7 +523,10 @@ namespace OpenSim.Region.CoreModules.Avatar.Inventory.Archiver
                 return false;
             }
 
-            sbyte assetType = ArchiveConstants.EXTENSION_TO_ASSET_TYPE[extension];
+            string rawUuid = filename.Remove(indx);
+            if (!UUID.TryParse(rawUuid, out UUID assetId))
+                return false;
+
             if (assetType == (sbyte)AssetType.Unknown)
             {
                 m_log.WarnFormat("[INVENTORY ARCHIVER]: Importing {0} byte asset {1} with unknown type", data.Length, assetId);
diff --git a/OpenSim/Region/CoreModules/World/Archiver/ArchiveReadRequest.cs b/OpenSim/Region/CoreModules/World/Archiver/ArchiveReadRequest.cs
index c3948f9a3a..42a0f37853 100644
--- a/OpenSim/Region/CoreModules/World/Archiver/ArchiveReadRequest.cs
+++ b/OpenSim/Region/CoreModules/World/Archiver/ArchiveReadRequest.cs
@@ -306,7 +306,7 @@ namespace OpenSim.Region.CoreModules.World.Archiver
 
                 string filename = assetPath[ArchiveConstants.ASSETS_PATH.Length..];
                 int indx = filename.LastIndexOf(ArchiveConstants.ASSET_EXTENSION_SEPARATOR);
-                if (indx < 0)
+                if (indx < 32)
                 {
                     m_log.ErrorFormat(
                         "[ARCHIVER]: Could not find extension information in asset path {0} since it's missing the separator {1}.  Skipping",
@@ -315,7 +315,7 @@ namespace OpenSim.Region.CoreModules.World.Archiver
                     continue;
                 }
                 string extension = filename[indx..];
-                if (ArchiveConstants.EXTENSION_TO_ASSET_TYPE.ContainsKey(extension))
+                if (ArchiveConstants.EXTENSION_TO_ASSET_TYPE.TryGetValue(extension, out sbyte ext))
                 {
                     string id = filename.Remove(indx);
                     if (UUID.TryParse(id, out UUID uuid))
@@ -323,7 +323,7 @@ namespace OpenSim.Region.CoreModules.World.Archiver
                         ids.Add(id);
                         uuids.Add(uuid);
                         datas.Add(data);
-                        types.Add(ArchiveConstants.EXTENSION_TO_ASSET_TYPE[extension]);
+                        types.Add(ext);
                         continue;
                     }
                 }