diff --git a/SourceGen/DisasmProject.cs b/SourceGen/DisasmProject.cs
index 2d79ade..1b22267 100644
--- a/SourceGen/DisasmProject.cs
+++ b/SourceGen/DisasmProject.cs
@@ -119,6 +119,28 @@ namespace SourceGen {
         /// </summary>
         public ProjectProperties ProjectProps { get; private set; }
 
+        /// <summary>
+        /// "Cooked" form of relocation data (e.g. OmfReloc).  This does not contain the file
+        /// offset, as that's expected to be used as the dictionary key.
+        ///
+        /// Will be null unless the project was generated from a relocatable source.
+        /// </summary>
+        [Serializable]
+        public class RelocData {
+            public byte Width;      // width of area written by relocator
+            public byte Shift;      // amount to shift the value
+            public int Value;       // value used (unshifted, full width)
+
+            public RelocData() { }  // for deserialization
+
+            public RelocData(byte width, byte shift, int value) {
+                Width = width;
+                Shift = shift;
+                Value = value;
+            }
+        }
+        public Dictionary<int, RelocData> RelocList { get; set; }
+
         #endregion // data to save & restore
 
 
diff --git a/SourceGen/ProjectFile.cs b/SourceGen/ProjectFile.cs
index a8a2116..d3c81ee 100644
--- a/SourceGen/ProjectFile.cs
+++ b/SourceGen/ProjectFile.cs
@@ -53,7 +53,7 @@ namespace SourceGen {
         // ignore stuff that's in one side but not the other.  However, if we're opening a
         // newer file in an older program, it's worth letting the user know that some stuff
         // may get lost as soon as they save the file.
-        public const int CONTENT_VERSION = 3;
+        public const int CONTENT_VERSION = 4;
 
         private static readonly bool ADD_CRLF = true;
 
@@ -417,6 +417,7 @@ namespace SourceGen {
         public List<SerVisualization> Visualizations { get; set; }
         public List<SerVisBitmapAnimation> VisualizationAnimations { get; set; }
         public Dictionary<string, SerVisualizationSet> VisualizationSets { get; set; }
+        public Dictionary<string, DisasmProject.RelocData> RelocList { get; set; }
 
         /// <summary>
         /// Serializes a DisasmProject into an augmented JSON string.
@@ -525,6 +526,15 @@ namespace SourceGen {
 
             spf.ProjectProps = new SerProjectProperties(proj.ProjectProps);
 
+            if (proj.RelocList != null) {
+                // The objects can serialize directly, but the Dictionary key can't be an int.
+                spf.RelocList =
+                    new Dictionary<string, DisasmProject.RelocData>(proj.RelocList.Count);
+                foreach (KeyValuePair<int, DisasmProject.RelocData> kvp in proj.RelocList) {
+                    spf.RelocList.Add(kvp.Key.ToString(), kvp.Value);
+                }
+            }
+
             JavaScriptSerializer ser = new JavaScriptSerializer();
             string cereal = ser.Serialize(spf);
             sb.Append(cereal);
@@ -832,6 +842,19 @@ namespace SourceGen {
                 }
             }
 
+            // Deserialize relocation data.  This was added in v1.7.
+            if (spf.RelocList != null) {
+                proj.RelocList = new Dictionary<int, DisasmProject.RelocData>();
+                foreach (KeyValuePair<string, DisasmProject.RelocData> kvp in spf.RelocList) {
+                    if (!ParseValidateKey(kvp.Key, spf.FileDataLength,
+                            Res.Strings.PROJECT_FIELD_RELOC_DATA, report, out int intKey)) {
+                        continue;
+                    }
+                    proj.RelocList.Add(intKey, kvp.Value);
+                }
+            }
+
+
             return true;
         }
 
diff --git a/SourceGen/Res/Strings.xaml b/SourceGen/Res/Strings.xaml
index cb97889..fd4b84c 100644
--- a/SourceGen/Res/Strings.xaml
+++ b/SourceGen/Res/Strings.xaml
@@ -155,6 +155,7 @@ limitations under the License.
     <system:String x:Key="str_ProjectFieldLvTable">local variable table</system:String>
     <system:String x:Key="str_ProjectFieldNote">note</system:String>
     <system:String x:Key="str_ProjectFieldOperandFormat">operand format</system:String>
+    <system:String x:Key="str_ProjectFieldRelocData">reloc data</system:String>
     <system:String x:Key="str_ProjectFieldStatusFlags">status flag override</system:String>
     <system:String x:Key="str_ProjectFieldTypeHint">type hint</system:String>
     <system:String x:Key="str_ProjectFieldUserLabel">user-defined label</system:String>
diff --git a/SourceGen/Res/Strings.xaml.cs b/SourceGen/Res/Strings.xaml.cs
index 4b80c0d..cd5da68 100644
--- a/SourceGen/Res/Strings.xaml.cs
+++ b/SourceGen/Res/Strings.xaml.cs
@@ -291,6 +291,8 @@ namespace SourceGen.Res {
             (string)Application.Current.FindResource("str_ProjectFieldNote");
         public static string PROJECT_FIELD_OPERAND_FORMAT =
             (string)Application.Current.FindResource("str_ProjectFieldOperandFormat");
+        public static string PROJECT_FIELD_RELOC_DATA =
+            (string)Application.Current.FindResource("str_ProjectFieldRelocData");
         public static string PROJECT_FIELD_STATUS_FLAGS =
             (string)Application.Current.FindResource("str_ProjectFieldStatusFlags");
         public static string PROJECT_FIELD_TYPE_HINT =
diff --git a/SourceGen/Tools/Omf/Loader.cs b/SourceGen/Tools/Omf/Loader.cs
index f2d61b2..5efd9e2 100644
--- a/SourceGen/Tools/Omf/Loader.cs
+++ b/SourceGen/Tools/Omf/Loader.cs
@@ -48,11 +48,15 @@ namespace SourceGen.Tools.Omf {
         }
         private List<SegmentMapEntry> mSegmentMap;
 
+        private Dictionary<int, DisasmProject.RelocData> mRelocData =
+            new Dictionary<int, DisasmProject.RelocData>();
+
 
         /// <summary>
         /// Constructor.
         /// </summary>
         /// <param name="omfFile">OMF file to load.</param>
+        /// <param name="formatter">Text formatter.</param>
         public Loader(OmfFile omfFile, Formatter formatter) {
             Debug.Assert(omfFile.OmfFileKind == OmfFile.FileKind.Load);
 
@@ -83,7 +87,7 @@ namespace SourceGen.Tools.Omf {
                 Debug.Assert(i == ent.Segment.SegNum);
             }
 
-            if (!GenerateOutput()) {
+            if (!GenerateDataAndProject()) {
                 mSegmentMap = null;
                 return false;
             }
@@ -258,7 +262,7 @@ namespace SourceGen.Tools.Omf {
             return true;
         }
 
-        private bool GenerateOutput() {
+        private bool GenerateDataAndProject() {
             // Sum up the segment lengths to get the total project size.
             int totalLen = 0;
             foreach (SegmentMapEntry ent in mSegmentMap) {
@@ -339,7 +343,8 @@ namespace SourceGen.Tools.Omf {
             }
 
             proj.PrepForNew(data, "new_proj");
-            proj.ApplyChanges(cs, false, out RangeSet unused);
+            proj.ApplyChanges(cs, false, out _);
+            proj.RelocList = mRelocData;
 
             mLoadedData = data;
             mNewProject = proj;
@@ -401,6 +406,10 @@ namespace SourceGen.Tools.Omf {
                     }
                 }
 
+                if (omfRel.Shift < -32 || omfRel.Shift > 32) {
+                    Debug.WriteLine("Invalid reloc shift " + omfRel.Shift);
+                    return false;
+                }
                 if (omfRel.Shift < 0) {
                     relocAddr >>= -omfRel.Shift;
                 } else if (omfRel.Shift > 0) {
@@ -430,6 +439,9 @@ namespace SourceGen.Tools.Omf {
                         Debug.WriteLine("Invalid reloc width " + omfRel.Width);
                         return false;
                 }
+
+                mRelocData.Add(bufOffset + omfRel.Offset,
+                    new DisasmProject.RelocData((byte)omfRel.Width, (byte)omfRel.Shift, relocAddr));
             }
 
             return true;
@@ -439,10 +451,17 @@ namespace SourceGen.Tools.Omf {
         /// Edits the data file, essentially putting the jump table entries into the
         /// "loaded" state.
         /// </summary>
+        /// <remarks>
+        /// We don't use ent.Segment.Relocs, as that is expected to be empty.
+        /// </remarks>
         private bool RelocJumpTable(SegmentMapEntry ent, byte[] data, int bufOffset,
                 ChangeSet cs) {
             const int ENTRY_LEN = 14;
 
+            if (ent.Segment.Relocs.Count != 0) {
+                Debug.WriteLine("WEIRD: jump table has reloc data?");
+            }
+
             byte[] srcData = ent.Segment.GetConstData();
             Array.Copy(srcData, 0, data, bufOffset, srcData.Length);
 
@@ -458,7 +477,7 @@ namespace SourceGen.Tools.Omf {
             TypedRangeSet undoSet = new TypedRangeSet();
 
             for (int i = 8; i + 4 <= ent.Segment.Length; i += ENTRY_LEN) {
-                int userId = RawData.GetWord(data, bufOffset + i, 2, false);
+                //int userId = RawData.GetWord(data, bufOffset + i, 2, false);
                 int fileNum = RawData.GetWord(data, bufOffset + i + 2, 2, false);
 
                 if (fileNum == 0) {
@@ -476,7 +495,7 @@ namespace SourceGen.Tools.Omf {
                     return false;
                 }
 
-                // Note: segment ends right after FileNum, so don't try to read further
+                // Note: segment might end right after FileNum, so don't try to read further
                 // until we've confirmed that FileNum != 0.
 
                 int segNum = RawData.GetWord(data, bufOffset + i + 4, 2, false);
diff --git a/SourceGen/Tools/Omf/WpfGui/OmfSegmentViewer.xaml b/SourceGen/Tools/Omf/WpfGui/OmfSegmentViewer.xaml
index e876528..ef31098 100644
--- a/SourceGen/Tools/Omf/WpfGui/OmfSegmentViewer.xaml
+++ b/SourceGen/Tools/Omf/WpfGui/OmfSegmentViewer.xaml
@@ -31,6 +31,7 @@ limitations under the License.
 
         <system:String x:Key="str_FileOffsetLenFmt">File offset {0}, length {1} ({2})</system:String>
         <system:String x:Key="str_RecordHeaderFmt">Records ({0}):</system:String>
+        <system:String x:Key="str_RelocHeaderFmt">Relocation dictionary ({0}):</system:String>
     </Window.Resources>
 
     <Grid Margin="8">
@@ -59,7 +60,7 @@ limitations under the License.
                   HeadersVisibility="Column"
                   CanUserReorderColumns="False"
                   CanUserSortColumns="False"
-                  SelectionMode="Single">
+                  SelectionMode="Extended">
             <DataGrid.Resources>
                 <!-- make the no-focus color the same as the in-focus color -->
                 <SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightBrushKey}"
@@ -86,7 +87,7 @@ limitations under the License.
                   HeadersVisibility="Column"
                   CanUserReorderColumns="False"
                   CanUserSortColumns="False"
-                  SelectionMode="Single">
+                  SelectionMode="Extended">
             <DataGrid.Resources>
                 <!-- make the no-focus color the same as the in-focus color -->
                 <SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightBrushKey}"
@@ -101,7 +102,7 @@ limitations under the License.
             </DataGrid.Columns>
         </DataGrid>
 
-        <TextBlock Grid.Row="5" Text="Relocation dictionary:" Margin="0,8,0,0"
+        <TextBlock Grid.Row="5" Text="{Binding RelocHeaderStr, FallbackValue=Relocation dictionary:}" Margin="0,8,0,0"
                    Visibility="{Binding HasRelocs, Converter={StaticResource BoolToVis}}"/>
         <DataGrid Name="relocList" Grid.Row="6" Height="145" Margin="0,8,0,0"
                   Visibility="{Binding HasRelocs, Converter={StaticResource BoolToVis}}"
@@ -115,7 +116,7 @@ limitations under the License.
                   HeadersVisibility="Column"
                   CanUserReorderColumns="False"
                   CanUserSortColumns="False"
-                  SelectionMode="Single">
+                  SelectionMode="Extended">
             <DataGrid.Resources>
                 <!-- make the no-focus color the same as the in-focus color -->
                 <SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightBrushKey}"
diff --git a/SourceGen/Tools/Omf/WpfGui/OmfSegmentViewer.xaml.cs b/SourceGen/Tools/Omf/WpfGui/OmfSegmentViewer.xaml.cs
index d4e9186..e672a49 100644
--- a/SourceGen/Tools/Omf/WpfGui/OmfSegmentViewer.xaml.cs
+++ b/SourceGen/Tools/Omf/WpfGui/OmfSegmentViewer.xaml.cs
@@ -48,6 +48,12 @@ namespace SourceGen.Tools.Omf.WpfGui {
             set { mRecordHeaderStr = value; OnPropertyChanged(); }
         }
 
+        private string mRelocHeaderStr;
+        public string RelocHeaderStr {
+            get { return mRelocHeaderStr; }
+            set { mRelocHeaderStr = value; OnPropertyChanged(); }
+        }
+
         public class HeaderItem {
             public string Name { get; private set; }
             public string Value { get; private set; }
@@ -141,6 +147,8 @@ namespace SourceGen.Tools.Omf.WpfGui {
 
             fmt = (string)FindResource("str_RecordHeaderFmt");
             RecordHeaderStr = string.Format(fmt, RecordItems.Count);
+            fmt = (string)FindResource("str_RelocHeaderFmt");
+            RelocHeaderStr = string.Format(fmt, RelocItems.Count);
         }
 
         private void GenerateHeaderItems() {