Unknown database file format .DAT I am trying to find out the database name of this file.

I opened it via hex editor:

http://gyazo.com/5b579bd2ef9620aa833bf0743a480230

Any help is appreciated.

Client sent me this file. It is very old of his DOS program but not sure which database it is.

Any help is appreciated.

When I open it using Notepad I see this:

 €D                                                                      D                         147306154      340000          ‡      P„                                    Ã                     124126290      340001        O‰      †                                    Ä                     124126323      340002       ÀDŠ      ‡                                    Å                     124126289      340003        BŠ      ‡                                    Æ                     124126202      340004
     @Š      ‡                                    Ç                     124126253      340005
     €{Š      `‡                                    È                     124126244      340006       $‹      h‡                                    É                     124126245      340007
I was thinking of a flat file database. There was a Swedish producer that was creating them, but I cannot remember their name right now.

Something like https://filedb.codeplex.com/

(I meant this as a comment, not as an answer, but I do not have enough rights to comment these days.)