How recover data from .dat file without application

Dears,
We are active for a few customers who will use an windows application with, so far we can see, an flat file UNIX structure database. It seems that the structure of the database is nearly the structure who used in Berkeley DB. That means that we have analysed the database and found 'information blocks' like Btree, hash tables etc.
Is their any way to start reverse engineering on the single .dat file, if we have no idea what fields or record the application uses.
It is hard to believe but the software firm did not want to make the data free .. only for a lot of money .. so far we know the customer is the owner of the data, and the firm have to do that!
But we can't wait to get the data out this file ... we need some little more help.. to analyse the database and its block structure .. so when we know the database structure (the blocks) we can start analysing the data.
Many thanks,
for any reply
Eric

Hi Eric,
We've rarely seen applications using BDB use that extension for the database (it's of course possible to name the file any way you want, but generally the BDB database files use .db as the extension). So, I have a feeling you're facing a file created with another database engine. Nevertheless, here is what you can do:
- determine the file's size on the disk and post it here;
- run the following BDB utilities on the .dat file (we'll call it "file.dat")
db_verify file.dat
db_stat -d file.datand post here the output.
You can download Berkeley DB here:
http://www.oracle.com/technology/software/products/berkeley-db/db/index.html
For information on how to build on Windows:
http://www.oracle.com/technology/documentation/berkeley-db/db/ref/build_win/intro.html
Detailed description of the utilities I've mentioned:
http://www.oracle.com/technology/documentation/berkeley-db/db/utility/db_verify.html
http://www.oracle.com/technology/documentation/berkeley-db/db/utility/db_stat.html
Also, I would like to suggest you the following.
Since the data within the file is probably confidential, I can take this issue in private and open a Metalink SR for you. I can assure you that we will treat all information as confidential.
If you would like me to help this way, just send me an email at: andrei dot costache at oracle dot com.
Regards,
Andrei

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