Files that contain the .db3 file extension are most commonly associated with the SQLite database application.
SQLite creates databases using plain files and allows for the storage and retrieval of structured data using the SQL programming language. The database files that are created with the SQLite software application are saved with the .db3 file extension.
The dBASE III database application also uses the .db3 file suffix. These files are also database files, but instead of being created with the SQLite software, they are created with the dBASE III software.
The S.T.A.L.K.E.R gaming software also uses the .db3 file extension for game files that are referenced by the gaming application.
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If you have additional information about the DB3 file format or software that uses files with the DB3 suffix, please do get in touch - we would love hearing from you.