diff --git a/Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/osgi/GhidraSourceBundle.java b/Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/osgi/GhidraSourceBundle.java
index 241135958a..68f8c51ac7 100644
--- a/Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/osgi/GhidraSourceBundle.java
+++ b/Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/osgi/GhidraSourceBundle.java
@@ -47,6 +47,7 @@ import generic.io.NullPrintWriter;
 import generic.jar.ResourceFile;
 import ghidra.app.script.*;
 import ghidra.util.Msg;
+import utilities.util.FileUtilities;
 
 /**
  * {@link GhidraSourceBundle} represents a Java source directory that is compiled on build to an OSGi bundle.
@@ -173,20 +174,18 @@ public class GhidraSourceBundle extends GhidraBundle {
 	 * 
 	 * @param sourceFile a source file from this bundle
 	 * @return the class name
+	 * @throws ClassNotFoundException if {@code sourceFile} isn't contained in this bundle
 	 */
-	public String classNameForScript(ResourceFile sourceFile) {
-		try {
-			String path = sourceFile.getCanonicalPath();
-
-			// get the relative path and chop ".java" from the end
-			path = path.substring(1 + getSourceDirectory().getCanonicalPath().length(),
-				path.length() - 5);
-			return path.replace(File.separatorChar, '.');
-		}
-		catch (IOException e) {
-			Msg.error(this, "getting class name for script", e);
-			return null;
+	public String classNameForScript(ResourceFile sourceFile) throws ClassNotFoundException {
+		String relativePath = FileUtilities.relativizePath(getSourceDirectory(), sourceFile);
+		if (relativePath == null) {
+			throw new ClassNotFoundException(
+				String.format("Failed to find script file '%s' in source directory '%s'",
+					sourceFile, getSourceDirectory()));
 		}
+		// chop ".java" from the end
+		relativePath = relativePath.substring(0, relativePath.length() - 5);
+		return relativePath.replace(File.separatorChar, '.');
 	}
 
 	void clearBuildErrors(ResourceFile sourceFile) {
diff --git a/Ghidra/Features/Base/src/main/java/ghidra/app/script/GhidraScriptUtil.java b/Ghidra/Features/Base/src/main/java/ghidra/app/script/GhidraScriptUtil.java
index e386c800d9..6099eceeef 100644
--- a/Ghidra/Features/Base/src/main/java/ghidra/app/script/GhidraScriptUtil.java
+++ b/Ghidra/Features/Base/src/main/java/ghidra/app/script/GhidraScriptUtil.java
@@ -32,6 +32,7 @@ import ghidra.app.util.headless.HeadlessAnalyzer;
 import ghidra.framework.Application;
 import ghidra.util.Msg;
 import ghidra.util.classfinder.ClassSearcher;
+import utilities.util.FileUtilities;
 
 /**
  * A utility class for managing script directories and ScriptInfo objects.
@@ -129,19 +130,13 @@ public class GhidraScriptUtil {
 	 * @return the source directory if found, or null if not
 	 */
 	public static ResourceFile findSourceDirectoryContaining(ResourceFile sourceFile) {
-		String sourcePath;
-		try {
-			sourcePath = sourceFile.getCanonicalPath();
-			for (ResourceFile sourceDir : getScriptSourceDirectories()) {
-				if (sourcePath.startsWith(sourceDir.getCanonicalPath() + File.separatorChar)) {
-					return sourceDir;
-				}
+		for (ResourceFile sourceDir : getScriptSourceDirectories()) {
+			if (FileUtilities.relativizePath(sourceDir, sourceFile) != null) {
+				return sourceDir;
 			}
 		}
-		catch (IOException e) {
-			Msg.error(GhidraScriptUtil.class,
-				"Failed to find script in any script directory: " + sourceFile.toString(), e);
-		}
+		Msg.error(GhidraScriptUtil.class,
+			"Failed to find script in any script directory: " + sourceFile.toString());
 		return null;
 	}
 
diff --git a/Ghidra/Framework/Generic/src/test/java/utilities/util/FileUtilitiesTest.java b/Ghidra/Framework/Generic/src/test/java/utilities/util/FileUtilitiesTest.java
index 1b428d42c3..142c6b4ca6 100644
--- a/Ghidra/Framework/Generic/src/test/java/utilities/util/FileUtilitiesTest.java
+++ b/Ghidra/Framework/Generic/src/test/java/utilities/util/FileUtilitiesTest.java
@@ -140,6 +140,38 @@ public class FileUtilitiesTest {
 		assertNull(relative);
 	}
 
+	@Test
+	public void testRelativizePath_ResourceFiles() {
+		ResourceFile f1 = new ResourceFile(new File("/a/b"));
+		ResourceFile f2 = new ResourceFile(new File("/a/b/c"));
+		String relative = FileUtilities.relativizePath(f1, f2);
+		assertEquals("c", relative);
+	}
+
+	@Test
+	public void testRelativizePath_ResourceFiles2() {
+		ResourceFile f1 = new ResourceFile(new File("/a/b"));
+		ResourceFile f2 = new ResourceFile(new File("/a/b/c/d"));
+		String relative = FileUtilities.relativizePath(f1, f2);
+		assertEquals("c/d", relative);
+	}
+
+	@Test
+	public void testRelativizePath_ResourceFiles_NotRelated() {
+		ResourceFile f1 = new ResourceFile(new File("/a/b"));
+		ResourceFile f2 = new ResourceFile(new File("/c/d"));
+		String relative = FileUtilities.relativizePath(f1, f2);
+		assertNull(relative);
+	}
+
+	@Test
+	public void testRelativizePath_ResourceFiles_Same() {
+		ResourceFile f1 = new ResourceFile(new File("/a/b"));
+		ResourceFile f2 = new ResourceFile(new File("/a/b"));
+		String relative = FileUtilities.relativizePath(f1, f2);
+		assertNull(relative);
+	}
+
 	private ResourceFile createNestedTempFile(String path) throws Exception {
 
 		String tmpdir = AbstractGenericTest.getTestDirectoryPath();
diff --git a/Ghidra/Framework/Utility/src/main/java/utilities/util/FileUtilities.java b/Ghidra/Framework/Utility/src/main/java/utilities/util/FileUtilities.java
index 02ad63ab1a..2d3ada122d 100644
--- a/Ghidra/Framework/Utility/src/main/java/utilities/util/FileUtilities.java
+++ b/Ghidra/Framework/Utility/src/main/java/utilities/util/FileUtilities.java
@@ -902,6 +902,32 @@ public final class FileUtilities {
 		return childPath;
 	}
 
+	/**
+	 * Return the relative path string of one resource file in another. If
+	 * no path can be constructed or the files are the same, then null is returned.
+	 * 
+	 * Note: unlike {@link #relativizePath(File, File)}, this function does not resolve symbolic links.
+	 *
+	 * <P>For example, given, in this order, two files with these paths
+	 *  <code>/a/b</code> and <code>/a/b/c</code>, this method will return 'c'.
+	 *
+	 * @param f1 the parent resource file
+	 * @param f2 the child resource file
+	 * @return the relative path of {@code f2} in {@code f1}
+	 */
+	public static String relativizePath(ResourceFile f1, ResourceFile f2) {
+		StringBuilder sb = new StringBuilder(f2.getName());
+		f2 = f2.getParentFile();
+		while (f2 != null) {
+			if (f1.equals(f2)) {
+				return sb.toString();
+			}
+			sb.insert(0, f2.getName() + File.separator);
+			f2 = f2.getParentFile();
+		}
+		return null;
+	}
+
 	public static boolean exists(URI uri) {
 
 		String scheme = uri.getScheme();