Add NullGame as an inherited class of RomGame and assign Global.Game to this instead of null whenever a ROM is not loaded. This fixes using the record dialog with no game loaded and lots of other situations during Null Emulator. Also cleaned up the record dialog a bit

BizHawk.MultiClient/BizHawk.MultiClient.csproj

@@ -238,6 +238,7 @@
     <Compile Include="NEStools\SpriteViewer.cs">
       <SubType>Component</SubType>
     </Compile>
+    <Compile Include="NullGame.cs" />
     <Compile Include="PlayMovie.cs">
       <SubType>Form</SubType>
     </Compile>

BizHawk.MultiClient/MainForm.cs

@@ -67,6 +67,7 @@ namespace BizHawk.MultiClient
 		public MainForm(string[] args)
 		{
 			InitializeComponent();
+			Global.Game = new NullGame();
 			if (Global.Config.ShowLogWindow)
 			{
 				LogConsole.ShowConsole();
@@ -804,6 +805,7 @@ namespace BizHawk.MultiClient
 
 		public bool LoadRom(string path)
 		{
+			if (path == null) return false;
 			using (var file = new HawkFile())
 			{
 				string[] romExtensions = new string[] { "SMS", "PCE", "SGX", "GG", "SG", "BIN", "SMD", "GB", "NES", "ROM" };
@@ -2013,7 +2015,7 @@ namespace BizHawk.MultiClient
 		{
 			CloseGame();
 			Global.Emulator = new NullEmulator();
-			Global.Game = null;
+			Global.Game = new NullGame();
 			RamSearch1.Restart();
 			RamWatch1.Restart();
 			HexEditor1.Restart();

BizHawk.MultiClient/NullGame.cs

@@ -0,0 +1,75 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
+
+namespace BizHawk.MultiClient
+{
+	public class NullGame : RomGame
+	{
+		private List<string> options;
+		private const int BankSize = 4096;
+		new public RomStatus Status { get; private set; }
+		new public string Name { get { return "Null Game"; } set { } }
+		new public string FilesystemSafeName { get { return "Null Game"; } }
+
+		public NullGame() 
+		{
+			FileData = new byte[1];
+			FileData[0] = new byte();
+			RomData = new byte[1];
+			RomData[0] = new byte();
+			System = "Null";
+			Status = RomStatus.GoodDump;
+			options = new List<String>();
+			options.Add("null");
+		}
+		
+		private byte[] DeInterleaveSMD(byte[] source)
+		{
+			return FileData;
+		}
+
+		private void CheckForPatchOptions()
+		{
+		}
+		
+		new public string SaveRamPath
+		{
+			get
+			{
+				return Path.Combine(PathManager.MakeAbsolutePath(Global.Config.BasePath, ""), "Null Game.SaveRAM");
+			}
+		}
+		
+		
+
+		new public string SaveStatePrefix
+		{
+			get
+			{
+				string Bind = "";
+				if (Global.Config.BindSavestatesToMovies && Global.MainForm.UserMovie.Mode != MOVIEMODE.INACTIVE)
+					Bind += " - " + Path.GetFileNameWithoutExtension(Global.MainForm.UserMovie.Filename);
+				
+				return Path.Combine(PathManager.MakeAbsolutePath(Global.Config.BasePath, ""), "Null Game" + Bind);
+			}
+		}
+
+		new public string MoviePrefix
+		{
+			get
+			{
+				return PathManager.MakeAbsolutePath(Global.Config.BasePath, "") + "Null Game";
+			}
+		}
+
+		new public string ScreenshotPrefix
+		{
+			get
+			{
+				return PathManager.MakeAbsolutePath(Global.Config.BasePath, "") + "/" + "Null Game";
+			}
+		}
+	}
+}

BizHawk.MultiClient/RecordMovie.cs

@@ -86,7 +86,7 @@ namespace BizHawk.MultiClient
 								MovieToRecord.Header.Comments.Add(str);
 						}
 					}
-					
+					file.Delete();
 				}
 				
 				Global.MainForm.StartNewMovie(MovieToRecord, true);
@@ -112,7 +112,7 @@ namespace BizHawk.MultiClient
 			sfd.InitialDirectory = PathManager.MakeAbsolutePath(Global.Config.MoviesPath, "");
 			sfd.DefaultExt = ".tas";
 			sfd.FileName = Global.Game.FilesystemSafeName;
-			sfd.Filter = "Movie files (*.tas)|*.TAS";
+			sfd.Filter = "Movie files (*.tas)|*.tas";
 
 			Global.Sound.StopSound();
 			var result = sfd.ShowDialog();