Those are not valid Manager file names. They should be much longer random alphanumeric (hex) jumbles. Here is an answer @lubos posted in response to a question very much like yours about a year ago (click on the message snippet to see the whole thread):
A quick search of the forum produces other similar responses about the unreliability of data recovery programs.
My suggestion is to give up. If all you had was a chart of accounts with no transactions, you could have recreated it a brand new one in the time it has taken the two of us to write 4 posts. Since you did it last time, there is a new Guide on the subject of building charts of accounts: https://www.manager.io/guides/9181