diff --git a/DATabase/Import.cs b/DATabase/Import.cs
index 48de577e..5a4680b6 100644
--- a/DATabase/Import.cs
+++ b/DATabase/Import.cs
@@ -64,7 +64,7 @@ namespace SabreTools
 		/// Import the data from file into the database
 		/// </summary>
 		/// <returns>True if the data was imported, false otherwise</returns>
-		public bool ImportData ()
+		public bool ImportData()
 		{
 			// If file doesn't exist, error and return
 			if (!File.Exists(_filepath))
diff --git a/DATabase/TrimMerge.cs b/DATabase/TrimMerge.cs
index 71ad2f69..fde2e34a 100644
--- a/DATabase/TrimMerge.cs
+++ b/DATabase/TrimMerge.cs
@@ -35,14 +35,19 @@ namespace SabreTools
 		/// <summary>
 		/// Trim and process the given DAT or folder of DATs
 		/// </summary>
-		public void Process()
+		/// <returns>True if the DAT could be updated, false otherwise</returns>
+		public bool Process()
 		{
+			// If file doesn't exist, error and return
+			if (!File.Exists(_filename))
+			{
+				_logger.Error("File '" + _filename + "' doesn't exist");
+				return false;
+			}
+
 			_path = (_path == "" ? Environment.CurrentDirectory : _path);
 
-			// Drag and drop means quotes; we don't want quotes
-			_filename = _filename.Replace("\"", "");
-
-			// We also want the full path of the file, just in case
+			// We want the full path of the file, just in case
 			_filename = Path.GetFullPath(_filename);
 
 			// If it's a single file, handle it as such
@@ -68,7 +73,7 @@ namespace SabreTools
 				}
 			}
 
-			_logger.Close();
+			return true;
 		}
 
 		/// <summary>
diff --git a/DatSplit/DatSplit.cs b/DatSplit/DatSplit.cs
index d430ec8c..10fa8d41 100644
--- a/DatSplit/DatSplit.cs
+++ b/DatSplit/DatSplit.cs
@@ -68,14 +68,28 @@ namespace SabreTools
 		/// <summary>
 		/// Split a DAT based on filtering by 2 extensions
 		/// </summary>
-		public void Split()
+		/// <returns>True if DAT was split, false otherwise</returns>
+		public bool Split()
 		{
+			// If file doesn't exist, error and return
+			if (!File.Exists(_filename))
+			{
+				_logger.Error("File '" + _filename + "' doesn't exist");
+				return false;
+			}
+
 			List<RomData> romsA = new List<RomData>();
 			List<RomData> romsB = new List<RomData>();
 
 			// Load the current DAT to be processed
 			List<RomData> roms = RomManipulation.Parse(_filename, 0, 0, _logger);
 
+			// If roms is empty, return false
+			if (roms.Count == 0)
+			{
+				return false;
+			}
+
 			// Now separate the roms accordingly
 			foreach (RomData rom in roms)
 			{
@@ -95,10 +109,12 @@ namespace SabreTools
 			}
 
 			// Then write out both files
-			Output.WriteToDat(Path.GetFileNameWithoutExtension(_filename) + "." + _extA, Path.GetFileNameWithoutExtension(_filename) + "." + _extA,
+			bool success = Output.WriteToDat(Path.GetFileNameWithoutExtension(_filename) + "." + _extA, Path.GetFileNameWithoutExtension(_filename) + "." + _extA,
 				"", "", "", "", false, !RomManipulation.IsXmlDat(_filename), "", romsA, _logger);
-			Output.WriteToDat(Path.GetFileNameWithoutExtension(_filename) + "." + _extB, Path.GetFileNameWithoutExtension(_filename) + "." + _extB,
+			success &= Output.WriteToDat(Path.GetFileNameWithoutExtension(_filename) + "." + _extB, Path.GetFileNameWithoutExtension(_filename) + "." + _extB,
 				"", "", "", "", false, !RomManipulation.IsXmlDat(_filename), "", romsB, _logger);
+
+			return success;
 		}
 	}
 }