diff --git a/Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/archive/ProjectArchive.java b/Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/archive/ProjectArchive.java
index 4558918945..7546a4cbaa 100644
--- a/Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/archive/ProjectArchive.java
+++ b/Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/archive/ProjectArchive.java
@@ -17,7 +17,6 @@ package ghidra.app.plugin.core.datamgr.archive;
 
 import java.awt.Component;
 import java.io.IOException;
-import java.util.Objects;
 
 import javax.swing.Icon;
 
@@ -30,18 +29,19 @@ public class ProjectArchive implements DomainFileArchive {
 
 	private static Icon CLOSED_ICON = new GIcon("icon.plugin.datatypes.archive.project.closed");
 	private static Icon OPEN_ICON = new GIcon("icon.plugin.datatypes.archive.project.open");
+	
 	private DataTypeArchive dataTypeArchive;
-	private DomainFile originalDomainFile;
-	DataTypeManagerChangeListener categoryListener; // hold on to since it is stored in a weak set
+	private DomainFile sourceDomainFile;
+	private DataTypeManagerChangeListener categoryListener; // hold on to since it is stored in a weak set
 	private DataTypeManagerHandler archiveManager;
 	private DataTypeManager dataTypeManager;
 
 	ProjectArchive(DataTypeManagerHandler archiveManager, DataTypeArchive dataTypeArchive,
-			DomainFile originalDomainFile) {
+			DomainFile sourceDomainFile) {
 		this.archiveManager = archiveManager;
 		this.dataTypeArchive = dataTypeArchive;
 		this.dataTypeManager = dataTypeArchive.getDataTypeManager();
-		this.originalDomainFile = originalDomainFile;
+		this.sourceDomainFile = sourceDomainFile;
 		categoryListener = new ArchiveCategoryChangeListener();
 		dataTypeManager.addDataTypeManagerListener(categoryListener);
 	}
@@ -67,39 +67,19 @@ public class ProjectArchive implements DomainFileArchive {
 		return -1; // Project Archives appear between the ProgramArchive and FileArchives.
 	}
 
-	@Override
-	public int hashCode() {
-		return originalDomainFile.getFileID().hashCode();
-	}
-
-	@Override
-	public boolean equals(Object obj) {
-		if (this == obj) {
-			return true;
-		}
-		if (obj == null) {
-			return false;
-		}
-		if (getClass() != obj.getClass()) {
-			return false;
-		}
-		ProjectArchive other = (ProjectArchive) obj;
-		return Objects.equals(originalDomainFile.getFileID(), other.originalDomainFile.getFileID());
-	}
-
 	public boolean hasExclusiveAccess() {
 		return dataTypeArchive.hasExclusiveAccess();
 	}
 
 	@Override
 	public boolean isModifiable() {
-		DomainFile domainFile = getDomainObject().getDomainFile();
-		return domainFile.canSave();
+		DomainFile df = getDomainObject().getDomainFile();
+		return df.canSave();
 	}
 
 	@Override
 	public DomainFile getDomainFile() {
-		return originalDomainFile;
+		return sourceDomainFile;
 	}
 
 	@Override
@@ -109,8 +89,8 @@ public class ProjectArchive implements DomainFileArchive {
 
 	@Override
 	public boolean isChanged() {
-		DomainFile domainFile = dataTypeArchive.getDomainFile();
-		long lastModifiedTime = domainFile.getLastModifiedTime();
+		DomainFile df = dataTypeArchive.getDomainFile();
+		long lastModifiedTime = df.getLastModifiedTime();
 		return (lastModifiedTime == 0) || dataTypeArchive.isChanged();
 	}
 
@@ -134,7 +114,7 @@ public class ProjectArchive implements DomainFileArchive {
 	@Override
 	public void saveAs(Component component) throws IOException {
 		archiveManager.saveAs(dataTypeArchive);
-		originalDomainFile = dataTypeArchive.getDomainFile();
+		sourceDomainFile = dataTypeArchive.getDomainFile(); // update with new domain file
 		dataTypeArchive.updateID();
 	}
 
diff --git a/Ghidra/Framework/Project/src/main/java/ghidra/framework/data/GhidraFileData.java b/Ghidra/Framework/Project/src/main/java/ghidra/framework/data/GhidraFileData.java
index 29b3d70f0c..21be6cf89b 100644
--- a/Ghidra/Framework/Project/src/main/java/ghidra/framework/data/GhidraFileData.java
+++ b/Ghidra/Framework/Project/src/main/java/ghidra/framework/data/GhidraFileData.java
@@ -218,8 +218,8 @@ public class GhidraFileData {
 	}
 
 	/**
-	 * Returns a unique file-ID 
-	 * @return the ID
+	 * Returns a unique file-ID if one has been established or null
+	 * @return the file-ID or null if failed to obtain ID
 	 */
 	String getFileID() {
 		return fileID;
diff --git a/Ghidra/Framework/Project/src/main/java/ghidra/framework/model/DomainFile.java b/Ghidra/Framework/Project/src/main/java/ghidra/framework/model/DomainFile.java
index 0c75bea23e..3f590db7c3 100644
--- a/Ghidra/Framework/Project/src/main/java/ghidra/framework/model/DomainFile.java
+++ b/Ghidra/Framework/Project/src/main/java/ghidra/framework/model/DomainFile.java
@@ -65,8 +65,13 @@ public interface DomainFile extends Comparable<DomainFile> {
 	public boolean exists();
 
 	/**
-	 * Returns a unique file-ID 
-	 * @return the ID
+	 * Returns a unique file-ID if one has been established or null.  Examples which may result in 
+	 * null ID:
+	 * <ul>
+	 * <li>Very old project file which pre-dates introduction of file ID, or</li>
+	 * <li>Remote versioned file with lost connection</li> 
+	 * </ul>
+	 * @return the file-ID or null if failed to obtain ID.
 	 */
 	public String getFileID();