Thank's for the idea onlymel, but i'm afraid I didn't explain my real problem. I did recover a damaged dbx file using a software tool, but then the software did recover the emails ONE BY ONE in a separate file for each email, so I had about 3000 files with the extension eml. The idea was to recover back to outlook, ALL of them in some way.
I was urged to recover back to outlook the emails so I had to do the job one by one (using a LOT of time).
Now it's fine, but if anyone knows how to do this faster, I will really apreciate that, just in case one dbx become corrupted again