If on your personal computer, it's more than likely in your recycling/garbage
pin (on your desktop) and you can then restore the file.
If on a network drive, where deleting causes the file to be erased w/o
sending to recycling bin, you may need to contact your administrator and see
if they can recover a backup copy.
Or, if you setup XL to automatically create backup copies, you can check
that folder, and at least recover the amount of work saved since last backup
was made.