That's kind of a sketchy description. Did you send it to the "party concerned" and "they" sent it back to you? If no to both parts, then surely the answer to your question is "No!".
If yes to both parts, and you didn't check the file before overwriting your copy, then, yes.
But you really need to describe what happened to the document, what kind of file it is, and anything else you can think of.