diff --git a/SabreTools.Library/DatFiles/SoftwareList.cs b/SabreTools.Library/DatFiles/SoftwareList.cs
index b39424c0..7e5f0285 100644
--- a/SabreTools.Library/DatFiles/SoftwareList.cs
+++ b/SabreTools.Library/DatFiles/SoftwareList.cs
@@ -255,11 +255,23 @@ namespace SabreTools.Library.DatFiles
                         var dataArea = new DataArea
                         {
                             Name = reader.GetAttribute("name"),
-                            Size = Sanitizer.CleanSize(reader.GetAttribute("size")),
-                            Width = reader.GetAttribute("width"),
                             Endianness = reader.GetAttribute("endianness").AsEndianness(),
                         };
 
+                        // Set the size
+                        if (reader.GetAttribute("size") != null)
+                        {
+                            if (Int64.TryParse(reader.GetAttribute("width"), out long size))
+                                dataArea.Size = size;
+                        }
+
+                        // Set the width
+                        if (reader.GetAttribute("width") != null)
+                        {
+                            if (Int64.TryParse(reader.GetAttribute("width"), out long width))
+                                dataArea.Width = width;
+                        }
+
                         List<DatItem> roms = ReadDataArea(reader.ReadSubtree(), dataArea);
 
                         // If we got valid roms, add them to the list
@@ -771,7 +783,7 @@ namespace SabreTools.Library.DatFiles
                         xtw.WriteStartElement("dataarea");
                         xtw.WriteRequiredAttributeString("name", dataAreaName);
                         xtw.WriteOptionalAttributeString("size", rom.DataArea?.Size.ToString());
-                        xtw.WriteOptionalAttributeString("width", rom.DataArea?.Width);
+                        xtw.WriteOptionalAttributeString("width", rom.DataArea?.Width?.ToString());
                         xtw.WriteOptionalAttributeString("endianness", rom.DataArea?.Endianness.FromEndianness());
 
                         xtw.WriteStartElement("rom");
diff --git a/SabreTools.Library/DatItems/Auxiliary.cs b/SabreTools.Library/DatItems/Auxiliary.cs
index 67f2997e..07a1e749 100644
--- a/SabreTools.Library/DatItems/Auxiliary.cs
+++ b/SabreTools.Library/DatItems/Auxiliary.cs
@@ -59,7 +59,7 @@ namespace SabreTools.Library.DatItems
         /// Word width for the area
         /// </summary>
         [JsonProperty("width", DefaultValueHandling = DefaultValueHandling.Ignore)]
-        public string Width { get; set; } // TODO: (8|16|32|64) "8"
+        public long? Width { get; set; }
 
         /// <summary>
         /// Byte endianness of the area
diff --git a/SabreTools.Library/DatItems/Rom.cs b/SabreTools.Library/DatItems/Rom.cs
index dbbcccd0..c51c91af 100644
--- a/SabreTools.Library/DatItems/Rom.cs
+++ b/SabreTools.Library/DatItems/Rom.cs
@@ -390,7 +390,8 @@ namespace SabreTools.Library.DatItems
                 if (DataArea == null)
                     DataArea = new DataArea();
 
-                DataArea.Width = mappings[Field.DatItem_AreaWidth];
+                if (Int64.TryParse(mappings[Field.DatItem_AreaWidth], out long areaWidth))
+                    DataArea.Width = areaWidth;
             }
 
             if (mappings.Keys.Contains(Field.DatItem_AreaEndianness))
@@ -908,9 +909,9 @@ namespace SabreTools.Library.DatItems
                 return false;
 
             // Filter on area byte width
-            if (filter.DatItem_AreaWidth.MatchesPositiveSet(DataArea?.Width) == false)
+            if (filter.DatItem_AreaWidth.MatchesPositive(null, DataArea?.Width) == false)
                 return false;
-            if (filter.DatItem_AreaWidth.MatchesNegativeSet(DataArea?.Width) == true)
+            if (filter.DatItem_AreaWidth.MatchesNegative(null, DataArea?.Width) == true)
                 return false;
 
             // Filter on area endianness
diff --git a/SabreTools.Library/Filtering/Filter.cs b/SabreTools.Library/Filtering/Filter.cs
index fd4aa360..ddfdb656 100644
--- a/SabreTools.Library/Filtering/Filter.cs
+++ b/SabreTools.Library/Filtering/Filter.cs
@@ -136,7 +136,7 @@ namespace SabreTools.Library.Filtering
         // Rom (SoftwareList)
         public FilterItem<string> DatItem_AreaName { get; private set; } = new FilterItem<string>();
         public FilterItem<long?> DatItem_AreaSize { get; private set; } = new FilterItem<long?>() { Positive = null, Negative = null, Neutral = null };
-        public FilterItem<string> DatItem_AreaWidth { get; private set; } = new FilterItem<string>();
+        public FilterItem<long?> DatItem_AreaWidth { get; private set; } = new FilterItem<long?>() { Positive = null, Negative = null, Neutral = null };
         public FilterItem<Endianness> DatItem_AreaEndianness { get; private set; } = new FilterItem<Endianness>() { Positive = Endianness.NULL, Negative = Endianness.NULL };
         public FilterItem<LoadFlag> DatItem_LoadFlag { get; private set; } = new FilterItem<LoadFlag>() { Positive = LoadFlag.NULL, Negative = LoadFlag.NULL };
         public FilterItem<string> DatItem_Part_Name { get; private set; } = new FilterItem<string>();
@@ -652,7 +652,7 @@ namespace SabreTools.Library.Filtering
                     break;
 
                 case Field.DatItem_AreaWidth:
-                    SetStringFilter(DatItem_AreaWidth, value, negate);
+                    SetOptionalLongFilter(DatItem_AreaWidth, value, negate);
                     break;
 
                 case Field.DatItem_AreaEndianness: