diff --git a/core/org.eclipse.cdt.ui.tests/plugin.xml b/core/org.eclipse.cdt.ui.tests/plugin.xml
index 1072a81b42a..b281c1f38cf 100644
--- a/core/org.eclipse.cdt.ui.tests/plugin.xml
+++ b/core/org.eclipse.cdt.ui.tests/plugin.xml
@@ -220,4 +220,12 @@
           </enablement>
        </renameParticipant>
    	</extension>    
+
+    <extension point="org.eclipse.core.filesystem.filesystems">
+        <filesystem
+            scheme="bug278632">
+            <run class="org.eclipse.cdt.ui.tests.text.BasicCEditorTest$Bug278632FileSystem"/>
+        </filesystem>
+    </extension>
+
 </plugin>
diff --git a/core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/BasicCEditorTest.java b/core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/BasicCEditorTest.java
index fdb79f94f5e..19722ee1b71 100644
--- a/core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/BasicCEditorTest.java
+++ b/core/org.eclipse.cdt.ui.tests/ui/org/eclipse/cdt/ui/tests/text/BasicCEditorTest.java
@@ -11,12 +11,16 @@
 package org.eclipse.cdt.ui.tests.text;
 
 import java.io.File;
+import java.net.URI;
+import java.net.URISyntaxException;
 
 import junit.framework.Test;
 import junit.framework.TestSuite;
 
 import org.eclipse.core.filesystem.EFS;
+import org.eclipse.core.filesystem.IFileStore;
 import org.eclipse.core.filesystem.URIUtil;
+import org.eclipse.core.filesystem.provider.FileSystem;
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IProject;
 import org.eclipse.core.runtime.CoreException;
@@ -33,6 +37,7 @@ import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.graphics.RGB;
 import org.eclipse.swt.widgets.Event;
 import org.eclipse.ui.IEditorPart;
+import org.eclipse.ui.IEditorRegistry;
 import org.eclipse.ui.IWorkbenchPage;
 import org.eclipse.ui.PartInitException;
 import org.eclipse.ui.PlatformUI;
@@ -72,6 +77,32 @@ public class BasicCEditorTest extends BaseUITestCase {
 		}
 	}
 
+	public static class Bug278632FileSystem extends FileSystem {
+		public Bug278632FileSystem() {
+			getClass();
+		}
+
+		@Override
+		public IFileStore getStore(URI uri) {
+			try {
+				// For the test case, this just return the FS implementation
+				// used for the null filesystem.
+				// In a real application this would be a real implementation,
+				// however for the purposes
+				// of exposing the bug, any non-file:// scheme will do.
+				return EFS.getStore(new URI(
+						EFS.getNullFileSystem().getScheme(), uri
+								.getSchemeSpecificPart(), null));
+			} catch (URISyntaxException e) {
+				e.printStackTrace();
+				return null;
+			} catch (CoreException e) {
+				e.printStackTrace();
+				return null;
+			}
+		}
+	}
+
 	private static CEditor fEditor;
 	private static SourceViewer fSourceViewer;
 	private ICProject fCProject;
@@ -378,6 +409,33 @@ public class BasicCEditorTest extends BaseUITestCase {
 		assertSame(style.foreground, ppDirectiveColor);
 	}
 
+	public void testNonFileEFSResource_Bug278632() {
+		IWorkbenchPage page = PlatformUI.getWorkbench()
+				.getActiveWorkbenchWindow().getActivePage();
+		assertNotNull(page);
+
+		IEditorRegistry reg = page.getWorkbenchWindow().getWorkbench()
+				.getEditorRegistry();
+		String editorID = reg.getDefaultEditor(".c").getId();
+
+		URI uri = null;
+		try {
+			uri = new URI("bug278632", "/folder/file", null);
+		} catch (URISyntaxException e) {
+			e.printStackTrace();
+		}
+		assertNotNull(uri);
+
+		IEditorPart part = null;
+		try {
+			part = IDE.openEditor(page, uri, editorID, true);
+		} catch (PartInitException e) {
+			e.printStackTrace();
+		}
+		assertNotNull(part);
+		assertTrue(part instanceof CEditor);
+	}
+
 	/**
 	 * Type characters into the styled text.
 	 *