.D files. Progress Database or compiled C++ objetcs?

Hi I'm involved in a project to renew an old managament program.
I've copied the whole folder to examine the language programming and database used.
The folder has .AT Files (Preprocessed C++ source file) .I files and .D files.

At the beginnig I thought .D files were the database maybe progress database (but the folder hasnt other database files as schemas or similar..), but now I'm not sure and maybe are compiled objects (I don't know how to open it).
Every week the people on this office backup the whole folder, that's the reason I though the database is inside and maybe are the .D files....

What do you know? How can I know what db type is used by this program? How can I localize the database?
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