diff --git a/resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/localstore/FileSystemResourceManager.java b/resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/localstore/FileSystemResourceManager.java
index 14f6a86bfa5..6cf814d0a00 100644
--- a/resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/localstore/FileSystemResourceManager.java
+++ b/resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/localstore/FileSystemResourceManager.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2017 IBM Corporation and others.
+ * Copyright (c) 2000, 2024 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -557,15 +557,6 @@ public IHistoryStore getHistoryStore() {
 		return _historyStore;
 	}
 
-	/**
-	 * Returns the real name of the resource on disk. Returns null if no local
-	 * file exists by that name.  This is useful when dealing with
-	 * case insensitive file systems.
-	 */
-	public String getLocalName(IFileStore target) {
-		return target.fetchInfo().getName();
-	}
-
 	protected IPath getProjectDefaultLocation(IProject project) {
 		return workspace.getRoot().getLocation().append(project.getFullPath());
 	}
diff --git a/resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/resources/File.java b/resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/resources/File.java
index 6ca0f25e598..9312e8bd2b4 100644
--- a/resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/resources/File.java
+++ b/resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/resources/File.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2015 IBM Corporation and others.
+ * Copyright (c) 2000, 2024 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -21,6 +21,7 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.Reader;
+import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map.Entry;
@@ -221,25 +222,24 @@ void checkCreatable() throws CoreException {
 
 	IFileInfo create(int updateFlags, IProgressMonitor subMonitor, IFileStore store)
 			throws CoreException, ResourceException {
-		String message;
 		IFileInfo localInfo;
 		if (BitMask.isSet(updateFlags, IResource.FORCE)) {
-			// Assume  the file does not exist - otherwise implementation fails later
+			// Assume the file does not exist - otherwise implementation fails later
 			// during actual write
 			localInfo = new FileInfo(getName()); // with exists==false
 		} else {
-			localInfo=store.fetchInfo();
+			localInfo = store.fetchInfo();
 			if (localInfo.exists()) {
 				// return an appropriate error message for case variant collisions
 				if (!Workspace.caseSensitive) {
-					String name = getLocalManager().getLocalName(store);
+					String name = localInfo.getName();
 					if (name != null && !localInfo.getName().equals(name)) {
-						message = NLS.bind(Messages.resources_existsLocalDifferentCase,
-								IPath.fromOSString(store.toString()).removeLastSegments(1).append(name).toOSString());
+						String message = NLS.bind(Messages.resources_existsLocalDifferentCase,
+								Path.of(store.toString()).resolveSibling(name));
 						throw new ResourceException(IResourceStatus.CASE_VARIANT_EXISTS, getFullPath(), message, null);
 					}
 				}
-				message = NLS.bind(Messages.resources_fileExists, store.toString());
+				String message = NLS.bind(Messages.resources_fileExists, store.toString());
 				throw new ResourceException(IResourceStatus.FAILED_WRITE_LOCAL, getFullPath(), message, null);
 			}
 		}
diff --git a/resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/resources/Folder.java b/resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/resources/Folder.java
index 27c2ed1b28e..81178aca96e 100644
--- a/resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/resources/Folder.java
+++ b/resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/resources/Folder.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2015 IBM Corporation and others.
+ * Copyright (c) 2000, 2024 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -15,6 +15,7 @@
 package org.eclipse.core.internal.resources;
 
 import java.net.URI;
+import java.nio.file.Path;
 import org.eclipse.core.filesystem.IFileInfo;
 import org.eclipse.core.filesystem.IFileStore;
 import org.eclipse.core.internal.utils.Messages;
@@ -47,9 +48,10 @@ protected void assertCreateRequirements(IFileStore store, IFileInfo localInfo, i
 		if (!force && localInfo.exists()) {
 			//return an appropriate error message for case variant collisions
 			if (!Workspace.caseSensitive) {
-				String name = getLocalManager().getLocalName(store);
+				String name = localInfo.getName();
 				if (name != null && !store.getName().equals(name)) {
-					String msg = NLS.bind(Messages.resources_existsLocalDifferentCase, IPath.fromOSString(store.toString()).removeLastSegments(1).append(name).toOSString());
+					String msg = NLS.bind(Messages.resources_existsLocalDifferentCase,
+							Path.of(store.toString()).resolveSibling(name));
 					throw new ResourceException(IResourceStatus.CASE_VARIANT_EXISTS, getFullPath(), msg, null);
 				}
 			}
@@ -101,14 +103,14 @@ public void create(int updateFlags, boolean local, IProgressMonitor monitor) thr
 			assertCreateRequirements(store, localInfo, updateFlags);
 			workspace.beginOperation(true);
 			if (force && !Workspace.caseSensitive && localInfo.exists()) {
-				String name = getLocalManager().getLocalName(store);
+				String name = localInfo.getName();
 				if (name == null || localInfo.getName().equals(name)) {
 					delete(true, null);
 				} else {
 					// The file system is not case sensitive and a case variant exists at this
 					// location
 					String msg = NLS.bind(Messages.resources_existsLocalDifferentCase,
-							IPath.fromOSString(store.toString()).removeLastSegments(1).append(name).toOSString());
+							Path.of(store.toString()).resolveSibling(name));
 					throw new ResourceException(IResourceStatus.CASE_VARIANT_EXISTS, getFullPath(), msg, null);
 				}
 			}
diff --git a/resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/resources/Project.java b/resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/resources/Project.java
index 872223f6201..c7747fb5f85 100644
--- a/resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/resources/Project.java
+++ b/resources/bundles/org.eclipse.core.resources/src/org/eclipse/core/internal/resources/Project.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2022 IBM Corporation and others.
+ * Copyright (c) 2000, 2024 IBM Corporation and others.
  *
  * This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License 2.0
@@ -21,6 +21,7 @@
 package org.eclipse.core.internal.resources;
 
 import java.net.URI;
+import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
@@ -101,9 +102,10 @@ protected void assertCreateRequirements(IProjectDescription description) throws
 			IFileStore store = getStore();
 			IFileInfo localInfo = store.fetchInfo();
 			if (localInfo.exists()) {
-				String name = getLocalManager().getLocalName(store);
+				String name = localInfo.getName();
 				if (name != null && !store.getName().equals(name)) {
-					String msg = NLS.bind(Messages.resources_existsLocalDifferentCase, IPath.fromOSString(store.toString()).removeLastSegments(1).append(name).toOSString());
+					String msg = NLS.bind(Messages.resources_existsLocalDifferentCase,
+							Path.of(store.toString()).resolveSibling(name));
 					throw new ResourceException(IResourceStatus.CASE_VARIANT_EXISTS, getFullPath(), msg, null);
 				}
 			}