Database files are used to store different information about what files or information are you using on your computer. Most of them are hidden files, so you do not even see them when you browse through your directories with Windows Explorer, because they are hidden and not showed by Windows by default. You can change these settings in Windows Explorer under Tools – Folder options – View – Show hidden files and folders. Now you can see all the hidden files and with that all the database files. The most common database files that are going to be described in this article are the .db

The .db files, are also called Paradox database file or Progress database file. These files are used to store information, that the system is going to use later and it could acquire it later, but it is faster if the information is stored in it. The most common .db file is thumbs.db, a file where the windows store information about the pictures that are in each folder. As said, the information can be gathered at any time, and that means that you can delete this file if you wish. But it will be later created again, when you access the pictures that you have in a folder.

DBX files are database files, that are used to store information from different programs. One of them that is often used by regular users are the Outlook Express database files. All the emails that you see in your Outlook Express are stored in these files, based on the folders where you have the emails stored. If you would like to delete the emails, or store them to use them on another computer, you use these files. The DBX database are connected with with DBT database files. The DBT files are temporary copies of the DBX files, a way of security, if something goes wrong with the original files you can use the DBT files to restore the information.

Here is a list of other database file extensions:

  • .ABD - AmBiz Bonus Calculator data fileAdventure Builder database
  • .APX - Appexpert database file (Borland C++ 4.5)
  • .BDE - Borland Database Engine
  • .BSC - Compressed Apple II file archive created by BINSCIIDatabase (Source Browser)Pwbrmake object file (MS Fortran)
  • .BTR - Btrieve Database file; MS Frontpage-related file
  • .CDB - Card database (CardScan)Main database (TCU Turbo C Utilities)
  • .CIX - Database index (TCU Turbo C Utilities) 
  • .CRP - Encrypted database (dBASE IV)
  • .CVT - Backup file for CONVERTed database file (dBASE IV)
  • .DB - Configuration (dBASE IV - dBFast) Database (Paradox - Smartware)
  • .DB2 - Database (dBASE II)
  • .DB3 - Database (dBASE III)
  • .DBB - ANSYS Database BackupMopheus music file
  • .DBF - Database file (dBASE III/IV - FoxPro - dBFast - DataBoss)Oracle 8.x Tablespace File
  • .DBK - Database backup (dBASE IV)
  • .DBS - Database in SQL Windows formatDatafile (PRODAS)Printer description file (Word - Works)
  • .DBX - DatabaseDataBeam ImageMS Visual Foxpro Table
  • .DIF - Database (VisiCalc)Output from Diff command - script for Patch commandText file (Data Interchange Format)
  • .DSD - Database (DataShaper)
  • .DTF - Database file (PFS - Q&A)
  • .DWG - Drawing (Drafix)Drawing database (AutoCAD)
  • .EDB - MS Exchange Database ROOTS3 geneological data
  • .FW - Database (FrameWork)
  • .FW2 - Database (Framework II)
  • .FW3 - Database (Framework III)
  • .GDB - Interbase Database Group Mail file
  • .HIS - Insight II Dynamics Trajectory History fileSpy-CD CD Search Database file
  • .IOB - 3d graphics database in TDDD format
  • .IPD - InstallPROG 6 EDBS Install Database
  • .MB - Memo field values for database (Paradox)
  • .MDB - Database (MS Access)
  • .MDF - Accelio Capture Classic (JetForm) FillerI-deas Master Drafting Machine Data file Menu Definition file MS-SQL Master Database file
  • .MPD - MS Project database file
  • .MVB - DatabaseMS Multimedia viewer file
  • .NDB - Network database (Intellicom - Compex)
  • .NG - Online documentation database (Norton Guide)
  • .NSF - Lotus Notes / Domino database
  • .PFS - Database (PFS:FILE) - text file (PFS:Write)
  • .PHO - Phone database (Metz Phone for Windows)
  • .PQA - Palm Query Application File (database for wireless access)
  • .PX - Primary database index (Paradox)
  • .QAD - QuickArt database
  • .RDB - TrueVector Rules database, ZoneAlarm Rules database
  • .RPD - Database (RapidFile), RosaPro file, RPV Printing System file
  • .TDB - Database (TACT)
  • .THM - Microsoft Clipart Gallery database, Serif DrawPlus Theme
  • .UCS - Universal Classification Standard Database file
  • .WDB - Database (MS Works)
  • .ZBD - Canon ZoomBrowser Database file
  • .ZTD - Ziff Davis Media text database

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