Bug 119615 [PropertiesDialog] Can no longer change read-only property
I20051206-1200 1. open the properties for a file 2. change the read-only property 3. close 4. open the properties dialog again ==> state did not change
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/ResourceInfoPage.java
createArchiveButton(composite);
				} catch (CoreException e) {
					
				}
			}
			createDerivedButton(composite);
		}
	}
	private IContentDescription getContentDescription(IResource resource) {
		if (resource.getType() != IResource.FILE)
			return null;
		
		if (cachedContentDescription == null) {
			try {
				cachedContentDescription = ((IFile)resource).getContentDescription();
			} catch (CoreException e) {
				
			}
		}
		return cachedContentDescription;
	}
	/**
	 * Returns whether the given resource is a linked resource bound to a path
	 * variable.
	 * 
	 * @param resource
	 *            resource to test
	 * @return boolean <code>true</code> the given resource is a linked
	 *         resource bound to a path variable. <code>false</code> the given
	 *         resource is either not a linked resource or it is not using a