I might be wrong here but I thought LW did also. What LW would normally do is ask you if you wish to overwrite the file of the same filename. There's also an option on this window when it asks you whether to always use this answer. You might have ticked it. So what you can try is go to Tools>Options>View>Popups & tick option to Revert to default & press apply button. If that doesn't fix it then perhaps you're right.