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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .10 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | IBM Voice Type | IBM |
| .12 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | IBM Voice Type | IBM |
| .123 | IBM | Spreadsheet Files | Lotus 1-2-3 Spreadsheet | Lotus 1-2-3 | IBM |
| .12M | IBM | Spreadsheet Files | Lotus 1-2-3 SmartMaster File | IBM Collaboration Solutions | IBM |
| .13 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | IBM Voice Type | IBM |
| .14 | PTC | Backup Files | Versioned Pro/Engineer Project File | IBM Voice Type | IBM |
| .15 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | IBM Voice Type | IBM |
| .16 | Ubisoft | Game Files | Salt Lake Winter Olympics 2002 Game Music File | IBM Voice Type | IBM |
| .17 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | IBM Voice Type | IBM |
| .19 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | IBM Voice Type | IBM |
| .1DK | IBM | Backup Files | OS/2 Saved SKF Format | OS/2 | IBM |
| .2 | IBM | Data Files | IBM Embedded ViaVoice Voice Type Languages Scripts Data File Format | IBM Embedded ViaVoice | IBM |
| .2DK | IBM | Backup Files | OS/2 Saved SKF Format | OS/2 | IBM |
| .3 | IBM | Data Files | IBM Embedded ViaVoice Voice Type Languages Scripts Data | IBM Embedded ViaVoice | IBM |
| .4 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | IBM Voice Type | IBM |
| .4GE | IBM | Developer Files | IBM Informix 4GL Compiled Source Code | IBM Informix | IBM |
| .4GL | IBM | Developer Files | Informix 4GL Language Source Code | IBM Informix | IBM |
| .5 | Ubisoft | Game Files | Salt Lake Winter Olympics 2002 Game Music File | IBM Embedded ViaVoice | IBM |
| .5DK | IBM | Disk Image Files | Saved SKF Format File | OS/2 | IBM |
| .6 | Ubisoft | Game Files | Salt Lake Winter Olympics 2002 Game Music File | IBM Embedded ViaVoice | IBM |
| .6DK | IBM | Backup Files | OS/2 Saved SKF Format | OS/2 | IBM |
| .8 | IBM | Data Files | IBM Embedded ViaVoice Voice Type Languages Scripts Data | IBM Embedded ViaVoice | IBM |
| .9 | Ubisoft | Game Files | Salt Lake Winter Olympics 2002 Game Music File | IBM Embedded ViaVoice | IBM |
| .ACCT | IBM | System Files | IBM AIX System Data | IBM AIX | IBM |
| .ACX | Atari Corporation | Game Files | Atari ST Program | Rational Rose | IBM |
| .ADK | IBM | Backup Files | OS/2 Saved SKF Format | OS/2 | IBM |
| .ADN | Microsoft Corporation | Database Files | Access Blank Project Template | Lotus 1-2-3 | IBM |
| .ADX | CRI Middleware | Audio Files | ADX Audio File | IBM Lotus SmartSuit | IBM |
| .AGX | Open Source | Game Files | AGT Game File | Rational XDE | IBM |
| .AIO | IBM | Developer Files | APL Transfer Format File | IBM APL | IBM |
| .AMW | Anark Corporation | Developer Files | Anark Media Studio Workspace | IBM SPSS AMOS | IBM |
| .ANB | IBM | Data Files | Analytical Chart | i2 Analyst's Notebook | IBM |
| .APC | Savvius, Inc. | Data Files | AiroPeek Wireless Trace Capture File | Lotus 1-2-3 | IBM |
| .APP | Nokia | Executable Files | Symbian OS Application | IBM Lotus Symphony | IBM |
| .APX | Ability Plus Software | Raster Image Files | Ability Photopaint Studio Image | Lotus Approach | IBM |
| .AS3 | IBM | Developer Files | APL*PLUS Source Code File | IBM APL | IBM |
| .AS4 | askSam Systems | Backup Files | AskSam Backup File | eServer | IBM |
| .BB2 | IBM | Data Files | XBBS-OS/2, XGROUP, AV, ZTree Archiver Control Data File | OS/2 | IBM |
| .BDK | IBM | Disk Image Files | OS/2 Floppy Disk Image | OS/2 | IBM |
| .BFF | IBM | Backup Files | Backup File Format | AIX Toolbox | IBM |
| .BKS | Microsoft Corporation | Settings Files | NTBackup Settings File | Softcopy Reader | IBM |
| .BLO | IBM | Data Files | IBM DB2 Binary Large Object Data | IBM DB2 | IBM |
| .BLO- | IBM | Data Files | IBM DB2 Binary Large Object Data | IBM DB2 | IBM |
| .BND | IBM | Uncommon Files | DB2 CLI Bind File | IBM DB2 | IBM |
| .BNF | IBM | Data Files | IBM Voice Type Languages Map Data | IBM Voice Type | IBM |
| .BOF | IBM | Data Files | IBM Voice Type Languages Tasks Enroll File | IBM Voice Type | IBM |
| .BOS | IBM | Developer Files | Build Options Specification File | IBM Rational ClearCase | IBM |
| .BOX | Unknown Developer | Data Files | E-mail Mailbox | IBM Lotus Notes | IBM |
| .BPI | IBM | Uncommon Files | IBM Voice Type Languages New User File | IBM Voice Type | IBM |
| .BPT | Corel | Raster Image Files | CorelDRAW Bitmap Master Data | IBM InfoSphere Blueprint Director | IBM |
| .BSC | Microsoft Corporation | Developer Files | Visual Studio Source Browser Information File | Fortran | IBM |
| .CAT | Microsoft Corporation | System Files | Windows Catalog File | Rational Rose | IBM |
| .CBL | IBM | Developer Files | COBOL Source Code File | IBM COBOL | IBM |
| .CBX | IBM | Uncommon Files | Rational XDE Collaboration Data File | Rational XDE | IBM |
| .CH1 | IBM | Graphic Files | IBM Freelance Graphics Chart File | Lotus Freelance Graphics | IBM |
| .CIX | IBM | Data Files | Rational XDE | Rational XDE | IBM |
| .CLO | Pierre-Emmanuel Gougelet | Graphic Files | Cloe Ray-Tracer Image | IBM SPSS | IBM |
| .CLX | IBM | Data Files | Rational XDE | Rational XDE | IBM |
| .CMD | Microsoft Corporation | Executable Files | Windows Command File | OS/2 | IBM |
| .CNT | Microsoft Corporation | System Files | Help Contents File | Rational Rose | IBM |
| .CNX | IBM | Data Files | IBM Rational XDE Data | Rational XDE | IBM |
| .COB | IBM | Developer Files | COBOL Source Code File | IBM COBOL | IBM |
| .COL | Open Source | Data Files | Bibexcel File | IBM Lotus Notes | IBM |
| .CPF | IBM | Data Files | Cognos Project File | IBM Cognos Business Intelligence | IBM |
| .DCF | Sony Mobile Communications | Audio Files | DRM Content Format File | Taskmaster | IBM |
| .DGM | IBM | Graphic Files | IBM Lotus Freelance Graphics Diagram Data | Lotus Freelance Graphics | IBM |
| .DGX | IBM | Data Files | IBM Rational XDE Diagram | Rational XDE | IBM |
| .DLD | Campbell Scientific | Executable Files | EdLog Compiled Program | Lotus 1-2-3 | IBM |
| .DMD | Oracle Corporation | Developer Files | SQL Developer Data Modeler File | OS/2 | IBM |
| .DO | Unknown Developer | Web Files | Java Servlet | WebSphere Application Server | IBM |
| .DTF | IBM | Uncommon Files | Domino Temporary File | IBM Domino | IBM |
| .DVC | IBM | Data Files | Lotus 1-2-3 Data | Lotus 1-2-3 | IBM |
| .DW4 | IBM | Data Files | Visio/DisplayWrite 4 Text File | DisplayWrite | IBM |
| .DXL | IBM | Database Files | Domino XML Language File | IBM Domino | IBM |
| .EAR | Oracle Corporation | Executable Files | Java Enterprise Archive File | WebSphere Application Server | IBM |
| .EBS | Psychology Software Tools, Inc. | Executable Files | E-Run Version 1 Script File | Rational Rose | IBM |
| .EBX | IBM | Developer Files | Rational Rose 98 Compiled Script | Rational Rose | IBM |
| .EC | Informix Corporation | Developer Files | Informix ESQL/C Source | IBM Informix | IBM |
| .EID | IBM | Data Files | IBM Voice Type Languages Newuser File | IBM Voice Type | IBM |
| .ENX | IBM | Data Files | IBM Rational XDE Data | Rational XDE | IBM |
| .F40 | Digital Equipment Corporation | Developer Files | PDP-10 FORTRAN-4 Compiler Source File | Fortran | IBM |
| .FCC | Netegrity | Settings Files | Forms Credential Collector File | Netegrity SiteMinder | IBM |
| .FD | Data Access Worldwide | Data Files | DataFlex Data File | Fortran | IBM |
| .FDE | Ternion Corporation | Data Files | FLAMES Dataset Export File | AFP Workbench Viewer | IBM |
| .FDK | Interscape | Data Files | Fluentizer Fluent Dictionary | OS/2 | IBM |
| .FI | Microsoft Corporation | Settings Files | Fortran Interface Data | Fortran | IBM |
| .FMK | GFI Software | Data Files | FaxMaker File | Fortran | IBM |
| .FMT | Microsoft Corporation | Settings Files | FoxPro Format File | Lotus 1-2-3 | IBM |
| .FNP | IBM | Settings Files | IBM FileNet IDM Desktop Settings File | IBM FileNet | IBM |
| .FT | Vero Software | CAD Files | Edgecam Feature Template | IBM Lotus Notes | IBM |
| .GDF | Eytan Adar | Data Files | GUESS Graph Data Format File | WebSphere Development Studio | IBM |
| .GPZ | IBM | Data Files | IBM DB2 Document Manager Document History Data | IBM DB2 | IBM |
| .GRA | Microsoft Corporation | Data Files | Microsoft Graph File | IBM Lotus Notes | IBM |
| .HCM | IBM | Settings Files | IBM HCM Configuration File | z/OS and z/VM Hardware Configuration Manager (HCM) | IBM |
| .I3C | IBM | Data Files | IBM Voice Type Languages Newuser File | IBM Voice Type | IBM |
| .I3I | IBM | Uncommon Files | IBM Voice Type Languages New User File | IBM Voice Type | IBM |
| .IBS | IBM | Data Files | I2 iBase Data File | i2 iBase | IBM |
| .ID | IBM | Uncommon Files | Lotus Notes User ID File | IBM Lotus Notes | IBM |
| .IDC | Pierre-Emmanuel Gougelet | Uncommon Files | Core Software Tech IDC File | IBM Lotus Notes | IBM |
| .IFX | IBM | Data Files | Rational XDE Data | Rational Rose | IBM |
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