diff --git a/core/org.eclipse.cdt.core/ChangeLog b/core/org.eclipse.cdt.core/ChangeLog
index 32709347415..ae28695d6c2 100644
--- a/core/org.eclipse.cdt.core/ChangeLog
+++ b/core/org.eclipse.cdt.core/ChangeLog
@@ -1,3 +1,13 @@
+2004-04-27 Alain Magloire
+
+	Fix for PR 60182
+	* model/org/eclipse/cdt/internal/core/model/ArchiveContainer.java
+	* model/org/eclipse/cdt/internal/core/model/BinarContainer.java
+	* model/org/eclipse/cdt/internal/core/model/CContainer.java
+	* model/org/eclipse/cdt/internal/core/model/CProject.java
+	* model/org/eclipse/cdt/internal/core/model/IncludeReference.java
+	* model/org/eclipse/cdt/internal/core/model/Openable.java
+
 2004-04-26 Alain Magloire
 
 	Changes in the PathEntryStore API
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/ArchiveContainer.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/ArchiveContainer.java
index 3099ca5f147..ad98fa73c2a 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/ArchiveContainer.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/ArchiveContainer.java
@@ -39,6 +39,7 @@ public class ArchiveContainer extends Openable implements IArchiveContainer {
 		throws CModelException {
 		// this will bootstrap/start the runner for the project.
 		CModelManager.getDefault().getBinaryRunner(getCProject());
+		CModelManager.getDefault().putInfo(this, info);
 		return true;
 	}
 
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/BinaryContainer.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/BinaryContainer.java
index 570d01e10ed..0112de9bdca 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/BinaryContainer.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/BinaryContainer.java
@@ -49,6 +49,7 @@ public class BinaryContainer extends Openable implements IBinaryContainer {
 		throws CModelException {
 		// this will bootstrap/start the runner for the project.
 		CModelManager.getDefault().getBinaryRunner(getCProject());
+		CModelManager.getDefault().putInfo(this, info);
 		return true;
 	}
 
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/CContainer.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/CContainer.java
index bf7ad019115..b3285811160 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/CContainer.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/CContainer.java
@@ -22,7 +22,6 @@ import org.eclipse.core.resources.IContainer;
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IFolder;
 import org.eclipse.core.resources.IResource;
-import org.eclipse.core.resources.IWorkspaceRoot;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.Path;
@@ -165,10 +164,12 @@ public class CContainer extends Openable implements ICContainer {
 		boolean validInfo = false;
 		try {
 			IResource res = getResource();
-			if (res != null && (res instanceof IWorkspaceRoot || res.getProject().isOpen())) {
+			if (res != null && res.isAccessible()) {
 				// put the info now, because computing the roots requires it
 				CModelManager.getDefault().putInfo(this, info);
 				validInfo = computeChildren(info, res);
+			} else {
+				throw newNotPresentException();
 			}
 		} finally {
 			if (!validInfo) {
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/CProject.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/CProject.java
index acf5925c293..2c05810360c 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/CProject.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/CProject.java
@@ -38,7 +38,6 @@ import org.eclipse.cdt.core.model.ISourceEntry;
 import org.eclipse.cdt.core.model.ISourceRoot;
 import org.eclipse.core.resources.IProject;
 import org.eclipse.core.resources.IResource;
-import org.eclipse.core.resources.IWorkspaceRoot;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IPath;
 import org.eclipse.core.runtime.IProgressMonitor;
@@ -514,10 +513,12 @@ public class CProject extends Openable implements ICProject {
 		boolean validInfo = false;
 		try {
 			IResource res = getResource();
-			if (res != null && (res instanceof IWorkspaceRoot || res.getProject().isOpen())) {
+			if (res != null && res.isAccessible()) {
 				// put the info now, because computing the roots requires it
 				CModelManager.getDefault().putInfo(this, info);
 				validInfo = computeSourceRoots(info, res);
+			} else {
+				throw newNotPresentException();
 			}
 		} finally {
 			if (!validInfo) {
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/IncludeReference.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/IncludeReference.java
index 409036b781f..1e180a557c1 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/IncludeReference.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/IncludeReference.java
@@ -74,6 +74,7 @@ public class IncludeReference extends Openable implements IIncludeReference {
 	 * @see org.eclipse.cdt.internal.core.model.Openable#generateInfos(org.eclipse.cdt.internal.core.model.OpenableInfo, org.eclipse.core.runtime.IProgressMonitor, java.util.Map, org.eclipse.core.resources.IResource)
 	 */
 	protected boolean generateInfos(OpenableInfo info, IProgressMonitor pm, Map newElements, IResource underlyingResource) throws CModelException {
+		CModelManager.getDefault().putInfo(this, info);
 		return computeChildren(info, underlyingResource);
 	}
 
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/LibraryReferenceArchive.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/LibraryReferenceArchive.java
index 0934f20024d..d0e96554470 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/LibraryReferenceArchive.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/LibraryReferenceArchive.java
@@ -6,6 +6,8 @@
  */
 package org.eclipse.cdt.internal.core.model;
 
+import java.io.File;
+
 import org.eclipse.cdt.core.IBinaryParser.IBinaryArchive;
 import org.eclipse.cdt.core.model.ICElement;
 import org.eclipse.cdt.core.model.ILibraryEntry;
@@ -45,7 +47,11 @@ public class LibraryReferenceArchive extends Archive implements ILibraryReferenc
 	 * @see org.eclipse.cdt.core.model.ICElement#exists()
 	 */
 	public boolean exists() {
-		return getPath().toFile().exists();
+		File f = getPath().toFile();
+		if (f != null) {
+			return f.exists();
+		}
+		return false;
 	}
 
 	/* (non-Javadoc)
diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/LibraryReferenceShared.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/LibraryReferenceShared.java
index a8d146ad3c3..b7df01d1f65 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/LibraryReferenceShared.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/model/LibraryReferenceShared.java
@@ -6,6 +6,8 @@
  */
 package org.eclipse.cdt.internal.core.model;
 
+import java.io.File;
+
 import org.eclipse.cdt.core.IBinaryParser.IBinaryObject;
 import org.eclipse.cdt.core.model.ICElement;
 import org.eclipse.cdt.core.model.ILibraryEntry;
@@ -29,7 +31,11 @@ public class LibraryReferenceShared extends Binary implements ILibraryReference
 	 * @see org.eclipse.cdt.internal.core.model.Binary#getModificationStamp()
 	 */
 	protected long getModificationStamp() {
-		return getPath().toFile().lastModified();
+		File f = getPath().toFile();
+		if (f != null) {
+			return f.lastModified();
+		}
+		return 0;
 	}
 
 	/* (non-Javadoc)
@@ -39,6 +45,17 @@ public class LibraryReferenceShared extends Binary implements ILibraryReference
 		return null;
 	}
 
+	/* (non-Javadoc)
+	 * @see org.eclipse.cdt.core.model.ICElement#exists()
+	 */
+	public boolean exists() {
+		File f = getPath().toFile();
+		if (f != null) {
+			return f.exists();
+		}
+		return false;
+	}
+
 	/* (non-Javadoc)
 	 * @see org.eclipse.cdt.core.model.ICElement#getPath()
 	 */