Bug 161026 [Wizards] ProjectContentsLocationArea uses wrong file separator
org.eclipse.ui.internal.ide.dialogs.ProjectContentsLocationArea uses Linux style '/' file-separators regardless of platform. I will attach a patch against head that uses .toOSString() instead of the current .toString()
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/ProjectContentsLocationArea.java
if (isDefault()) {
			return null;
		}
		String locationFieldContents = locationPathField.getText();
		if (locationFieldContents.length() == 0) {
			return (IDEWorkbenchMessages.WizardNewProjectCreationPage_projectLocationEmpty);
		}
		URI newPath = getProjectLocationURI();
		if (newPath == null) {
			return IDEWorkbenchMessages.ProjectLocationSelectionDialog_locationError;
		}
		
		IProject project = existingProject;
		if (project == null) {
			String name = new Path(locationFieldContents).lastSegment();
			if (name != null && Path.EMPTY.isValidSegment(name)){
				project = ResourcesPlugin.getWorkspace().getRoot().getProject(name);
			}
			else {
				return IDEWorkbenchMessages.ProjectLocationSelectionDialog_locationError;
			}
		}
		IStatus locationStatus = project.getWorkspace()
				.validateProjectLocationURI(project, newPath);
		if (!locationStatus.isOK()) {
			return locationStatus.getMessage();
		}
		if (existingProject != null) {
			URI projectPath = existingProject.getLocationURI();
			if (projectPath != null && URIUtil.equals(projectPath, newPath)) {