If you have 'Always create backup copy' checked on Tools > Options > Save,
then the folder may contain a file called 'Backup of ...', containing the
original file as it was prior to the last edit (if any!). Failing that, go
to your last hard disk backup. If you don't have one, go and stand in the
corner for a while until you consider yourself appropriately reprimanded,
then start re-typing....