diff --git a/DatToMiss/DatToMiss.cs b/DatToMiss/DatToMiss.cs
index e6750a2e..0c682416 100644
--- a/DatToMiss/DatToMiss.cs
+++ b/DatToMiss/DatToMiss.cs
@@ -33,7 +33,7 @@ namespace SabreTools
 			// Output the title
 			Build.Start("DatToMiss");
 
-			string prefix = "", postfix = "", input = "";
+			string prefix = "", postfix = "", input = "", addext = "", repext = "";
 			bool tofile = false, help = false, usegame = true, quotes = false;
 			foreach (string arg in args)
 			{
@@ -57,14 +57,22 @@ namespace SabreTools
 						quotes = true;
 						break;
 					default:
-						if ((arg.StartsWith("-pre=") || arg.StartsWith("--prefix=")) && prefix == "")
+						if (arg.StartsWith("-pre=") || arg.StartsWith("--prefix="))
 						{
 							prefix = arg.Split('=')[1];
 						}
-						else if ((arg.StartsWith("-post=") || arg.StartsWith("--postfix=")) && postfix == "")
+						else if (arg.StartsWith("-post=") || arg.StartsWith("--postfix="))
 						{
 							postfix = arg.Split('=')[1];
 						}
+						else if (arg.StartsWith("-ae=") || arg.StartsWith("-add-ext="))
+						{
+							addext = arg.Split('=')[1];
+						}
+						else if (arg.StartsWith("-re=") || arg.StartsWith("-rep-ext="))
+						{
+							repext = arg.Split('=')[1];
+						}
 						else if (input == "" && File.Exists(arg.Replace("\"", "")))
 						{
 							input = arg.Replace("\"", "");
@@ -93,7 +101,7 @@ namespace SabreTools
 			name += Path.GetFileNameWithoutExtension(input) + "-miss.txt";
 
 			// Read in the roms from the DAT and then write them to the file
-			Output.WriteToText(name, Path.GetDirectoryName(input), RomManipulation.Parse(input, 0, 0, logger), logger, usegame, prefix, postfix, quotes);
+			Output.WriteToText(name, Path.GetDirectoryName(input), RomManipulation.Parse(input, 0, 0, logger), logger, usegame, prefix, postfix, addext, repext, quotes);
 		}
 	}
 }
diff --git a/SabreHelper/Build.cs b/SabreHelper/Build.cs
index fad0932b..6d742388 100644
--- a/SabreHelper/Build.cs
+++ b/SabreHelper/Build.cs
@@ -170,7 +170,9 @@ Options:
   -r, --roms		Output roms to miss instead of sets
   -pre=, --prefix=	Set prefix to be printed in front of all lines
   -post=, --postfix=	Set postfix to be printed behind all lines
-  -q, --quotes		Put double-quotes around each outputted item (not prefix/postfix)");
+  -q, --quotes		Put double-quotes around each outputted item (not prefix/postfix)
+  -ae=, --add-ext=	Add an extension to each outputted item
+  -re=, --rep-ext=	Replace all extensions with specified");
 					break;
 				default:
 					Console.Write("This is the default help output");
diff --git a/SabreHelper/Output.cs b/SabreHelper/Output.cs
index 13d1e643..7157d537 100644
--- a/SabreHelper/Output.cs
+++ b/SabreHelper/Output.cs
@@ -138,7 +138,8 @@ namespace SabreTools.Helper
 		/// <param name="postfix">Arbitrary string to postfix each line</param>
 		/// <param name="quotes">True if quotes should be put around the item, false otherwise (default)</param>
 		/// <returns>True if the file was written, false otherwise</returns>
-		public static bool WriteToText(string textfile, string outdir, List<RomData> roms, Logger logger, bool useGame = true, string prefix = "", string postfix = "", bool quotes = false)
+		public static bool WriteToText(string textfile, string outdir, List<RomData> roms, Logger logger, bool useGame = true, string prefix = "",
+			string postfix = "", string addext = "", string repext = "", bool quotes = false)
 		{
 			// Normalize the output directory
 			if (outdir == "")
@@ -166,6 +167,20 @@ namespace SabreTools.Helper
 				string lastgame = "";
 				foreach (RomData rom in roms)
 				{
+					string pre = prefix + (quotes ? "\"" : "");
+					string post = (quotes ? "\"" : "") + postfix;
+					string name = (useGame ? rom.Game : rom.Name);
+					if (repext != "")
+					{
+						string dir = Path.GetDirectoryName(name);
+						dir = (dir.EndsWith(Path.DirectorySeparatorChar.ToString()) ? dir : dir + Path.DirectorySeparatorChar);
+						name = dir + Path.GetFileNameWithoutExtension(name) + repext;
+					}
+					if (addext != "")
+					{
+						name += addext;
+					}
+
 					if (useGame && rom.Game != lastgame)
 					{
 						sw.WriteLine(prefix + (quotes ? "\"" : "") + rom.Game + (quotes ? "\"" : "") + postfix);