1) Were the words in understandable English, or were they incomprehensible letters and words?
2) What is the date that file was created/modified?
3) What is the file extension? Is it txt or did you open the file using Notepad and it worked for you?
4) Are there any additional files, names of wallets, or any additional information?

I think you opened an encrypted/encoded file, so your answers to these questions may help us a little.
If the words are in English, make sure they are in this list