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Website  EXT   Filetype description                                    
    File Extensions  ~DF  backup of Borland C++ Builder form definition file 
    FILExt  3K  Advent 3B2 Keyboard Definition 
    FILExt  3K  Al-Arabi Publisher Keyboard Definition 
    FILExt  ACD  Agent Character Definition (Microsoft Corporation) 
    File Extensions  ACD  Character definition file 
    FILExt  ADF  MicroSim PCBoard Photoplot Aperture Definition File 
    File Extensions  ADF  MicroSim PCBoard Photoplot aperture definition file 
    File Extensions  ADF  Winworks Ad DeFinition file 
    File Extensions  ADL  Archetype Definition Language file 
    FILExt  ADL  openEHR Archetype Definition Language File (openEHR Foundation) 
    TrID  ADL  openEHR Archetype Definition Language 
 Header Hexdump:  61 72 63 68 65 74 79 70 65 
    FILExt  BAD  Brutus Application Definition File 
    FILExt  BCX  Beam Report Standard Definition File (SYSTEAM) 
    Wikipedia  BDEF  Builder Definition - Websphere Portlet Factory 
    FILExt  BDF  Backup To CD-RW Backup Definition File 
    FILExt  BED  InfoSnorkel Blue Elephant Definition 
    FILExt  BEX  Kashmir 3D Transparent Color Definition 
    Cryer  BNK  Decent 2 FM sound instrument definition file 
    FILExt  BUT  Buttons! Button Definition 
    FILExt  C4D  Clonk Object Definition (RedWolf Design GmbH) 
    Cryer  C4D  Clonk object definition file 
    FILExt  CAD  Inago Rage Compact Arena Definition (Dejobaan Games) 
    FILExt  CDF  Channel Definition Format (Microsoft Corporation) 
    FileInfo  CDF  Channel Definition Format 
    TrID  CDF  Channel Definition Format 
 Header Hexdump:  3C 
    FileInfo  CDF  Content Definition File 
    FILExt  CDF  InstallShield Components Definition File (Acresso Software Inc.) 
    File Extensions  CDF  InstallShield Components Definition File 
    File Extensions  CDF  Ms Channel Definition Format 
    FILExt  CLR  PhotStyler Color Definition 
    Wikipedia  CLS  C class definition file 
    FILExt  CLS  C++ Class Definition 
    FILExt  CLS  MS VisC++/Visual Basic Class Definition 
    File Extensions  CLS  MS VisC++/Visual Basic class definition 
    FILExt  CMF  CaseMap File Viewer Definition (LexisNexis) 
    File Extensions  CMF  CaseMap file viewer definition 
    FILExt  CMRBK  CaseMap ReportBook Definition (LexisNexis) 
    FILExt  COD  Boxer/2 printer Code Definition File 
    File Extensions  COD  Boxer/2 printer code definition file 
    Wikipedia  COD  Code definition table - UUPC 
    Wikipedia  COD  Printer code definition file - Boxer/2 
    FILExt  COD  UUPC Code Definition Table 
    File Extensions  COD  UUPC code definition table 
    FILExt  CPF  CircuitCAM Manufacturing Process Definition File (Aegis Industrial Software Corporation) 
    FILExt  CRF  CHARTrunner Chart Definition (PQ Systems) 
    File Extensions  CRF  CHARTrunner Chart Definition 
    FILExt  CRM  CHARTrunner Multi-Chart Definition (PQ Systems) 
    FILExt  CRW  CHARTrunner Workspace Definition (PQ Systems) 
    File Extensions  CRW  CHARTrunner workspace definition file 
    FILExt  CSS  InterComm Part Body Definition 
    FILExt  CST  CHARTrunner Chart Style Definition (PQ Systems) 
    FILExt  CTG  Cartridge Definition File 
    Wikipedia  CUF  C Utilities Form definition - TCU Turbo C Utilities 
    File Extensions  CUF  C Utilities Form definition (Turbo C Utilities) 
    FILExt  CUF  Turbo C Utilities Form Definition (Borland Software Corporation) 
    FILExt  DAT  Terrasoft Dataset Definition File 
    File Extensions  DAT  Terrasoft dataset definition file 
    File Extensions  DAT  Terrasoft dataset definition file 
    FILExt  DDD  ColdFusion Verity Engine Fields Definition (Adobe Systems Incorporated) 
    TrID  DDD  ColdFusion Verity engine fields definition 
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    FILExt  DDF  ACT! Database Definition File (Best Software CRM Division) 
    File Extensions  DDF  Btrieve or Xtrieve Data Definition File metadata 
    FILExt  DDF  Doom Definition File 
    File Extensions  DDL  Data Definition Language : SQL file 
    FILExt  DDL  SQL Data Definition Language File 
    File Extensions  DEF  (Vis)C++ Definition 
    FILExt  DEF  C++ Definition 
    File Extensions  DEF  Datafile (table) definition file 
    Wikipedia  DEF  Linker definition file - TLink - WLink... 
    FILExt  DEF  Modula-2 Definition Module File 
    FileInfo  DEF  Module-Definition File 
    File Extensions  DEF  module definition file (config) 
    FILExt  DEF  Module Definition/Configuration File 
    FILExt  DEF  OPTLINK Digital Mars Module Definition File (Digital Mars) 
    FILExt  DEF  SGML Tag Definition 
    File Extensions  DEF  SGML Tag Definition 
    FILExt  DEF  TLink - Wlink - Others Linker Definition 
    File Extensions  DEF  TLink - WLink... : Linker definition file 
    FILExt  DEF  Visual C++ Definition 
    Cryer  DEF  Windows library definition file 
    FILExt  DFN  Definition File 
    FILExt  DOT  Corel Lines-Definition 
    File Extensions  DOT  Corel Lines definition file 
    Wikipedia  DOT  Line-type definition file - CorelDRAW 
    FILExt  DOV  Actuate Query Definition (Actuate Corporation) 
    FILExt  DS  Dynamics Solver Problem Definition (Juan M. Aguirregabiria) 
    File Extensions  DSD  Document Structure Definition File XML or WWW3 
    FILExt  DSD  Document Structure Definition File 
    FileInfo  DTD  Document Type Definition 
    File Extensions  DTD  Document Type Definition 
    FILExt  DTD  SGML Document Definition File 
    FILExt  DWS  Dreamweaver Site Definition File (Adobe Systems Incorporated) 
    FILExt  E78  IBM 3270 Terminal Emulator Screen Layout Definition 
    FILExt  EBF  EARS Definition Backup 
    File Extensions  EDD  Element Definition Document (FrameMaker+SGML documents) 
    FILExt  EDD  FrameMaker Element Definition Document (Adobe Systems Incorporated) 
    FILExt  EDL  ASAP Entity Definition Language File (Hewlett-Packard Development Company L.P.) 
    FILExt  EDT  External Editor Definition 
    FILExt  EFD  EARS Filter Definition 
    FILExt  EGG  Panda3D Transform Definition (Disney and Carnegie Mellon University's Entertainment Technology Center) 
    FILExt  ELD  EARS Label Definition 
    FILExt  EMM  EARS Mail Merge Definition 
    Wikipedia  END  Arrow-head definition file - CorelDRAW 
    FILExt  END  Corel Draw Arrow Definition 
    File Extensions  END  CorelDraw Arrow-head definition file 
    Cryer  END  CorelDraw arrow-head definition 
    FILExt  EPD  EARS Printer Definition 
    FILExt  EZC  EZGUI Designer Control Definition (Christopher R. Boss) 
    TrID  EZC  EZGUI Designer control definition 
 Header Hexdump:  3C 3C 3C 44 45 53 43 3E 3E 3E 0D 0A 09 
    FILExt  FBI  Total Annihilation Main Unit Definition File (Cavedog Entertainment) 
    TrID  FBI  Total Annihilation Main Unit Definition 
 Header Hexdump:  5B 55 4E 49 54 49 4E 46 4F 5D 
    FILExt  FBK  Train Simulator Shaders Definition File (Microsoft Corporation) 
    TrID  FDB  Fiasco Database: definition file 
 Header Hexdump:  46 44 42 48 00 
    File Extensions  FDB  Font definition block of SWT generator 
    FILExt  FDF  Format Definition File (IBM) 
    FILExt  FDF  Origin Fitting Function Definition File (OriginLab Corporation) 
    FILExt  FDM  Exchange Forms Designer Form Definition (Microsoft Corporation) 
    FILExt  FLASK  FlasKMPEG Language Definition File 
    FILExt  FLOW  floW Structured Data Definition (ontonym.net) 
    TrID  FNC  Vue D'Esprit 4 function definition 
 Header Hexdump:  FF FF FF 5D 00 00 00 02 00 01 00 00 00 FC FF 35  
    FILExt  FNC  Vue D'Esprit Funcation Definition (e-on software inc.) 
    TrID  FNC  Vue D'Esprit function definition (generic) 
 Header Hexdump:  FF FF FF 
    FILExt  FPD  MicroSim PCBoard External ASCII Footprint Definition File 
    FILExt  FPR  Fiasco Database Print Report Definition 
    File Extensions  FRBD  (fuzzy rule based definition)fuzzy system modelling environment in ebnf-notation 
    Cryer  FRM  Visual Basic source code /&nbsp MySql table definition file 
    FILExt  GBD  Great Budget Budget Definition File (Great Budget Software) 
    FILExt  GBF  Great Budget Fringe Definition File (Great Budget Software) 
    FILExt  GBL  Visual Basic Global Definition 
    File Extensions  GBL  Visual Basic Global Definition 
    FILExt  GCD  GNUe Class Definition 
    FILExt  GDF  FutuRUG Group Definition File (Two Brothers Software) 
    FILExt  GDF  GlossTeX Definition File 
    FILExt  GMD  Great Budget Model Definition for the Template (Great Budget Software) 
    FILExt  GMF  Great Budget Fringe Definition for the Template (Great Budget Software) 
    FILExt  GRF  Insight II Standard Graph Definition File (Accelrys Software Inc.) 
    FILExt  GXW  GRASS GIS Workspace Layout Definition (Open Source Geospatial Foundation) 
    FILExt  HCC  HydroCAD Stormwater Modeling System Storage Chamber Definition (HydroCAD Software Solutions LLC) 
    FILExt  HCR  HydroCAD Stormwater Modeling System Rainfall Definition (HydroCAD Software Solutions LLC) 
    FILExt  HCU  HydroCAD Stormwater Modeling System Units Definition File (HydroCAD Software Solutions LLC) 
    FILExt  HGL  DN Highlight Groups Definition 
    FILExt  HXV  Help 2 Virtual Topic Definition (Microsoft Corporation) 
    FILExt  ICD  Actuate Information Object Cache Definition (Actuate Corporation) 
    FILExt  IDD  MIDI Instrument Definition 
    File Extensions  IDD  MIDI Instrument Definition 
    TrID  IDE  Borland C++ Project definition 
 Header Hexdump:  42 6F 72 6C 61 6E 64 20 43 2B 2B 20 50 72 6F 6A  
    TrID  IDF  Microsoft Instrument Definition File 
 Header Hexdump:  52 49 46 46 
    FileInfo  IDF  MIDI Instrument Definition File 
    FILExt  IDF  MIDI Instruments Definition File (Microsoft Corporation) 
    File Extensions  IDF  Windows 95 : MIDI Instrument Definition 
    FILExt  IDL  OMG CORBA Interface Definition Language 
    File Extensions  IDL  Visual C++ : Interface definition library file 
    FILExt  IDL  Visual C++ Interface Definition File (Microsoft Corporation) 
    FileInfo  INS  Sample Cell II Instrument Definition File 
    FILExt  IXC  Index+ for Windows Code Definition File (System Simulation Ltd.) 
    FILExt  IXR  Index+ for Windows Report Definition File (System Simulation Ltd.) 
    FILExt  JDF  Job Definition Format Job File 
    TrID  JDF  Job Definition Format Job File 
 Header Hexdump:  3C 3F 78 6D 6C 20 
    FileInfo  JPD  Java Process Definition 
    FILExt  JPP  Jigsaw Puzzle Player Puzzle Definition (B&P Games B.V.) 
    FILExt  JRXML  JasperReports JRXML Report Definition (JasperSoft Corporation) 
    TrID  JRXML  JasperReports JRXML report definition 
 Header Hexdump:  3C 3F 78 6D 6C 20 76 65 72 73 69 6F 6E 3D 22 31  
    FileInfo  KEY  Keyboard Definition File 
    FILExt  KEY  Keyboard Definition File 
    File Extensions  KEY  Keyboard Definition File 
    TrID  KEY  QBX (MS Basic 7.x) Editor keyboard definition 
 Header Hexdump:  51 43 00 02 38 3F 
    FileInfo  LAB  WordPerfect Label Definition File 
    FileInfo  LBX  FoxPro Label Definition File 
    FILExt  LDF  Geoworks Glue Library Definition 
    File Extensions  LDF  Geoworks Library Definition File 
    Wikipedia  LDF  Library definition file - Geoworks Glue 
    FILExt  LG  Logo Procedure Definition 
    FILExt  LIN  AutoCAD Linetype Definition (Autodesk Inc.) 
    File Extensions  LNG  Language definition file 
    Wikipedia  LNG  Language definition file 
    FILExt  LNG  SourceEdit Language Definition 
    TrID  LNG  SourceEdit Language Definition 
 Header Hexdump:  93 B2 00 00 
    FILExt  LSR  Logos Library System 2.x Standard Reference Definition 
    File Extensions  MAN  XP definition file (see below) 
    File Extensions  MANIFEST  Windows Visual Stylesheet XML definition file 
    FILExt  MAPX  MapDotNet Map Definition File (I.S. Consulting Inc.) 
    FILExt  MAS  Focus Master Data Definition 
    FILExt  MBF  Corel Visual DTD Document Type Definition for SGML (Corel Corporation) 
    File Extensions  MBF  Corel Visual DTD Document Type Definition for SGML 
    FILExt  MDF  Menu Definition File 
    File Extensions  MDF  Menu definition file 
    File Extensions  MDM  Modem definition (TELIX) 
    Wikipedia  MDM  Modem definition file - TELIX 
    FILExt  MDM  Telix Modem Definition 
    FILExt  MFA  Site Server 3.0 Report Definition (Microsoft Corporation) 
    FILExt  MLN  AutoCAD Multiline Definition (Autodesk Inc.) 
    File Extensions  MOB  Device definition (PEN Windows) 
    Wikipedia  MOB  Device definition file - PEN Windows 
    FILExt  MOD  EPOC Model Definition 
    FILExt  MTXDEF  Gestionnaire d'extensions Multiple Extension Definition (Définition d'extension multiple) (Francis Gagné) 
    Wikipedia  MU  Quattro pro for DOS Menu definition file - Quattro Pro 
    File Extensions  MU  Quattro pro for DOS MenU definition 
    FILExt  MWSP  Optix Screen Definition (mindwrap inc.) 
    FILExt  NAP  Napster Music Security Definition File 
    TrID  NET  SNNS network definition 
 Header Hexdump:  53 4E 4E 53 20 6E 65 74 77 6F 72 6B 20 64 65 66  
    FILExt  NET  Stuttgart Neural Network Simulator Network Definition 
    FILExt  NMF  Nuzzler Basic Rule Definition File (Securepoint Security Solutions) 
    File Extensions  ODH  Object Definition Head 
    File Extensions  ODL  Object Definition Language (Object Library Source for OLE applications) 
    FILExt  ODL  Object Definition Language 
    FILExt  ODL  Visual C++ Type Library Source (Interface Definition Language File) (Microsoft Corporation) 
    Wikipedia  OFD  Form definition - ObjectView 
    File Extensions  OFD  ObjectView Form Definition 
    Cryer  OPF  FlipBook definition file 
    FILExt  OVLDEF  Gestionnaire d'extensions Overload Definition (Définition de surcharge) (Francis Gagné) 
    FILExt  OXC  OlapX Cube Definition File (OlapX Software) 
    FILExt  P2M  Peer2Mail Archive Part and Definition (SoftBulldog) 
    Wikipedia  PAD  Keypad definition - Telemate 
    File Extensions  PAD  Keypad definition PR: Paddles/TELEMATE 
    FILExt  PAD  Telemate Keypad Definition 
    File Extensions  PAR  Spartpar definition 
    TrID  PAT  SNNS pattern definition 
 Header Hexdump:  53 4E 4E 53 20 70 61 74 74 65 72 6E 20 64 65 66  
    FILExt  PAT  Stuttgart Neural Network Simulator Pattern Definition 
    File Extensions  PDF  Analyser Protocol definition file 
    FILExt  PDF  Analyser Protocol Definition 
    FILExt  PDF  ArcView Preferences Definition File (ESRI) 
    File Extensions  PDF  ArcView preferences definition file 
    File Extensions  PDF  Microsoft package definition file 
    FILExt  PDF  Netware Printer Definition File 
    FILExt  PDF  Package Definition File 
    Wikipedia  PDF  Package Definition File