diff --git a/CrossModel/OfflineList.Deserializer.cs b/CrossModel/OfflineList.Deserializer.cs
new file mode 100644
index 00000000..4e91a9b6
--- /dev/null
+++ b/CrossModel/OfflineList.Deserializer.cs
@@ -0,0 +1,137 @@
+using System.Linq;
+using SabreTools.Models.OfflineList;
+
+namespace SabreTools.Serialization.CrossModel
+{
+    public partial class OfflineList : IModelSerializer<Dat, Models.Metadata.MetadataFile>
+    {
+        /// <inheritdoc/>
+#if NET48
+        public Dat Deserialize(Models.Metadata.MetadataFile obj)
+#else
+        public Dat? Deserialize(Models.Metadata.MetadataFile? obj)
+#endif
+        {
+            if (obj == null)
+                return null;
+
+            var header = obj.Read<Models.Metadata.Header>(Models.Metadata.MetadataFile.HeaderKey);
+            var dat = header != null ? ConvertHeaderFromInternalModel(header) : new Dat();
+
+            var machines = obj.Read<Models.Metadata.Machine[]>(Models.Metadata.MetadataFile.MachineKey);
+            if (machines != null && machines.Any())
+            {
+                dat.Games = new Games
+                {
+                    Game = machines
+                        .Where(m => m != null)
+                        .Select(ConvertMachineFromInternalModel)
+                        .ToArray()
+                };
+            }
+
+            return dat;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Metadata.Header"/> to <cref="Models.OfflineList.Dat"/>
+        /// </summary>
+        private static Dat ConvertHeaderFromInternalModel(Models.Metadata.Header item)
+        {
+            var dat = new Dat
+            {
+                NoNamespaceSchemaLocation = item.ReadString(Models.Metadata.Header.SchemaLocationKey),
+            };
+
+            if (item.ContainsKey(Models.Metadata.Header.NameKey)
+                || item.ContainsKey(Models.Metadata.Header.ImFolderKey)
+                || item.ContainsKey(Models.Metadata.Header.DatVersionKey)
+                || item.ContainsKey(Models.Metadata.Header.SystemKey)
+                || item.ContainsKey(Models.Metadata.Header.ScreenshotsWidthKey)
+                || item.ContainsKey(Models.Metadata.Header.ScreenshotsHeightKey)
+                || item.ContainsKey(Models.Metadata.Header.InfosKey)
+                || item.ContainsKey(Models.Metadata.Header.CanOpenKey)
+                || item.ContainsKey(Models.Metadata.Header.NewDatKey)
+                || item.ContainsKey(Models.Metadata.Header.SearchKey)
+                || item.ContainsKey(Models.Metadata.Header.RomTitleKey))
+            {
+                dat.Configuration = new Configuration
+                {
+                    DatName = item.ReadString(Models.Metadata.Header.NameKey),
+                    ImFolder = item.ReadString(Models.Metadata.Header.ImFolderKey),
+                    DatVersion = item.ReadString(Models.Metadata.Header.DatVersionKey),
+                    System = item.ReadString(Models.Metadata.Header.SystemKey),
+                    ScreenshotsWidth = item.ReadString(Models.Metadata.Header.ScreenshotsWidthKey),
+                    ScreenshotsHeight = item.ReadString(Models.Metadata.Header.ScreenshotsHeightKey),
+                    Infos = item.Read<Infos>(Models.Metadata.Header.InfosKey),
+                    CanOpen = item.Read<CanOpen>(Models.Metadata.Header.CanOpenKey),
+                    NewDat = item.Read<NewDat>(Models.Metadata.Header.NewDatKey),
+                    Search = item.Read<Search>(Models.Metadata.Header.SearchKey),
+                    RomTitle = item.ReadString(Models.Metadata.Header.RomTitleKey),
+                };
+            }
+
+            if (item.ContainsKey(Models.Metadata.Header.ImagesKey))
+            {
+                dat.GUI = new GUI
+                {
+                    Images = item.Read<Images>(Models.Metadata.Header.ImagesKey),
+                };
+            }
+
+            return dat;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Metadata.Machine"/> to <cref="Models.OfflineList.Game"/>
+        /// </summary>
+        private static Game ConvertMachineFromInternalModel(Models.Metadata.Machine item)
+        {
+            var game = new Game
+            {
+                ImageNumber = item.ReadString(Models.Metadata.Machine.ImageNumberKey),
+                ReleaseNumber = item.ReadString(Models.Metadata.Machine.ReleaseNumberKey),
+                Title = item.ReadString(Models.Metadata.Machine.NameKey),
+                SaveType = item.ReadString(Models.Metadata.Machine.SaveTypeKey),
+                Publisher = item.ReadString(Models.Metadata.Machine.PublisherKey),
+                Location = item.ReadString(Models.Metadata.Machine.LocationKey),
+                SourceRom = item.ReadString(Models.Metadata.Machine.SourceRomKey),
+                Language = item.ReadString(Models.Metadata.Machine.LanguageKey),
+                Im1CRC = item.ReadString(Models.Metadata.Machine.Im1CRCKey),
+                Im2CRC = item.ReadString(Models.Metadata.Machine.Im2CRCKey),
+                Comment = item.ReadString(Models.Metadata.Machine.CommentKey),
+                DuplicateID = item.ReadString(Models.Metadata.Machine.DuplicateIDKey),
+            };
+
+            var roms = item.Read<Models.Metadata.Rom[]>(Models.Metadata.Machine.RomKey);
+            if (roms != null && roms.Any())
+            {
+                game.RomSize = roms
+                    .Select(rom => rom.ReadString(Models.Metadata.Rom.SizeKey))
+                    .FirstOrDefault(s => s != null);
+
+                var romCRCs = roms
+                    .Where(r => r != null)
+                    .Select(ConvertFromInternalModel)
+                    .ToArray();
+
+                game.Files = new Models.OfflineList.Files { RomCRC = romCRCs };
+            }
+
+            return game;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.Metadata.Rom"/> to <cref="Models.OfflineList.FileRomCRC"/>
+        /// </summary>
+        private static FileRomCRC ConvertFromInternalModel(Models.Metadata.Rom item)
+        {
+            var fileRomCRC = new FileRomCRC
+            {
+                Extension = item.ReadString(Models.Metadata.Rom.ExtensionKey),
+                Content = item.ReadString(Models.Metadata.Rom.CRCKey),
+            };
+            return fileRomCRC;
+        }
+    }
+}
\ No newline at end of file
diff --git a/CrossModel/OfflineList.Serializer.cs b/CrossModel/OfflineList.Serializer.cs
new file mode 100644
index 00000000..393d4ad3
--- /dev/null
+++ b/CrossModel/OfflineList.Serializer.cs
@@ -0,0 +1,117 @@
+using System.Linq;
+using SabreTools.Models.OfflineList;
+
+namespace SabreTools.Serialization.CrossModel
+{
+    public partial class OfflineList : IModelSerializer<Dat, Models.Metadata.MetadataFile>
+    {
+        /// <inheritdoc/>
+#if NET48
+        public Models.Metadata.MetadataFile Serialize(Dat item)
+#else
+        public Models.Metadata.MetadataFile? Serialize(Dat? item)
+#endif
+        {
+            if (item == null)
+                return null;
+
+            var metadataFile = new Models.Metadata.MetadataFile
+            {
+                [Models.Metadata.MetadataFile.HeaderKey] = ConvertHeaderToInternalModel(item),
+            };
+
+            if (item?.Games?.Game != null && item.Games.Game.Any())
+            {
+                metadataFile[Models.Metadata.MetadataFile.MachineKey] = item.Games.Game
+                    .Where(g => g != null)
+                    .Select(ConvertMachineToInternalModel)
+                    .ToArray();
+            }
+
+            return metadataFile;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.OfflineList.Dat"/> to <cref="Models.Metadata.Header"/>
+        /// </summary>
+        private static Models.Metadata.Header ConvertHeaderToInternalModel(Dat item)
+        {
+            var header = new Models.Metadata.Header
+            {
+                [Models.Metadata.Header.SchemaLocationKey] = item.NoNamespaceSchemaLocation,
+            };
+
+            if (item.Configuration != null)
+            {
+                header[Models.Metadata.Header.NameKey] = item.Configuration.DatName;
+                header[Models.Metadata.Header.ImFolderKey] = item.Configuration.ImFolder;
+                header[Models.Metadata.Header.DatVersionKey] = item.Configuration.DatVersion;
+                header[Models.Metadata.Header.SystemKey] = item.Configuration.System;
+                header[Models.Metadata.Header.ScreenshotsWidthKey] = item.Configuration.ScreenshotsWidth;
+                header[Models.Metadata.Header.ScreenshotsHeightKey] = item.Configuration.ScreenshotsHeight;
+                header[Models.Metadata.Header.InfosKey] = item.Configuration.Infos;
+                header[Models.Metadata.Header.CanOpenKey] = item.Configuration.CanOpen;
+                header[Models.Metadata.Header.NewDatKey] = item.Configuration.NewDat;
+                header[Models.Metadata.Header.SearchKey] = item.Configuration.Search;
+                header[Models.Metadata.Header.RomTitleKey] = item.Configuration.RomTitle;
+            }
+
+            if (item.GUI != null)
+            {
+                header[Models.Metadata.Header.ImagesKey] = item.GUI.Images;
+            }
+
+            return header;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.OfflineList.Game"/> to <cref="Models.Metadata.Machine"/>
+        /// </summary>
+        private static Models.Metadata.Machine ConvertMachineToInternalModel(Game item)
+        {
+            var machine = new Models.Metadata.Machine
+            {
+                [Models.Metadata.Machine.ImageNumberKey] = item.ImageNumber,
+                [Models.Metadata.Machine.ReleaseNumberKey] = item.ReleaseNumber,
+                [Models.Metadata.Machine.NameKey] = item.Title,
+                [Models.Metadata.Machine.SaveTypeKey] = item.SaveType,
+                [Models.Metadata.Machine.PublisherKey] = item.Publisher,
+                [Models.Metadata.Machine.LocationKey] = item.Location,
+                [Models.Metadata.Machine.SourceRomKey] = item.SourceRom,
+                [Models.Metadata.Machine.LanguageKey] = item.Language,
+                [Models.Metadata.Machine.Im1CRCKey] = item.Im1CRC,
+                [Models.Metadata.Machine.Im2CRCKey] = item.Im2CRC,
+                [Models.Metadata.Machine.CommentKey] = item.Comment,
+                [Models.Metadata.Machine.DuplicateIDKey] = item.DuplicateID,
+            };
+
+            if (item.Files?.RomCRC != null && item.Files.RomCRC.Any())
+            {
+                machine[Models.Metadata.Machine.RomKey] = item.Files.RomCRC
+                    .Where(r => r != null)
+                    .Select(romCRC =>
+                    {
+                        var rom = ConvertToInternalModel(romCRC);
+                        rom[Models.Metadata.Rom.SizeKey] = item.RomSize;
+                        return rom;
+                    })
+                    .ToArray();
+            }
+
+            return machine;
+        }
+
+        /// <summary>
+        /// Convert from <cref="Models.OfflineList.FileRomCRC"/> to <cref="Models.Metadata.Rom"/>
+        /// </summary>
+        private static Models.Metadata.Rom ConvertToInternalModel(FileRomCRC item)
+        {
+            var rom = new Models.Metadata.Rom
+            {
+                [Models.Metadata.Rom.ExtensionKey] = item.Extension,
+                [Models.Metadata.Rom.CRCKey] = item.Content,
+            };
+            return rom;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Files/OfflineList.Deserializer.cs b/Files/OfflineList.Deserializer.cs
new file mode 100644
index 00000000..03c639c3
--- /dev/null
+++ b/Files/OfflineList.Deserializer.cs
@@ -0,0 +1,7 @@
+namespace SabreTools.Serialization.Files
+{
+    public partial class OfflineList : XmlFile<Models.OfflineList.Dat>
+    {
+        // All serialization logic is in the base class
+    }
+}
\ No newline at end of file
diff --git a/Files/OfflineList.Serializer.cs b/Files/OfflineList.Serializer.cs
new file mode 100644
index 00000000..03c639c3
--- /dev/null
+++ b/Files/OfflineList.Serializer.cs
@@ -0,0 +1,7 @@
+namespace SabreTools.Serialization.Files
+{
+    public partial class OfflineList : XmlFile<Models.OfflineList.Dat>
+    {
+        // All serialization logic is in the base class
+    }
+}
\ No newline at end of file
diff --git a/Streams/OfflineList.Deserializer.cs b/Streams/OfflineList.Deserializer.cs
new file mode 100644
index 00000000..efe18027
--- /dev/null
+++ b/Streams/OfflineList.Deserializer.cs
@@ -0,0 +1,7 @@
+namespace SabreTools.Serialization.Streams
+{
+    public partial class OfflineList : XmlFile<Models.OfflineList.Dat>
+    {
+        // All serialization logic is in the base class
+    }
+}
\ No newline at end of file
diff --git a/Streams/OfflineList.Serializer.cs b/Streams/OfflineList.Serializer.cs
new file mode 100644
index 00000000..efe18027
--- /dev/null
+++ b/Streams/OfflineList.Serializer.cs
@@ -0,0 +1,7 @@
+namespace SabreTools.Serialization.Streams
+{
+    public partial class OfflineList : XmlFile<Models.OfflineList.Dat>
+    {
+        // All serialization logic is in the base class
+    }
+}
\ No newline at end of file