Bug 300862 Change buttons order in PathVariableDialog
IMHO more intuitive order for buttons in PathVariableDialog would be [File...][Folder...][Variable...] instead of [File...][Variable...][Folder...]. I can provide a patch if the swap makes sense to you too ;)
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/PathVariableDialog.java
Composite buttonsComposite = new Composite(contents, SWT.NONE);
        buttonsComposite.setLayoutData(new GridData(SWT.END, SWT.CENTER, false,
        		false, 1, 1));
        GridLayout layout = new GridLayout(3, true);
        layout.marginWidth = 0;
        layout.marginHeight = 0;
        buttonsComposite.setLayout(layout);
        
        fileButton = new Button(buttonsComposite, SWT.PUSH);
        fileButton.setText(IDEWorkbenchMessages.PathVariableDialog_file);
        fileButton.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false,
        		false));
        if ((variableType & IResource.FILE) == 0) {
			fileButton.setEnabled(false);
		}
        fileButton.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                selectFile();
            }
        });
    	variableButton = new Button(buttonsComposite, SWT.PUSH);
    	variableButton.setText(IDEWorkbenchMessages.PathVariableDialog_variable);
 	    variableButton.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false,
    		false));
        variableButton.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                selectVariable();
            }
        });