| .IIB | IBM | Arquivos 3D | IBM Lotus Notes Data | IBM Lotus Notes | IBM |
| .IL | Microsoft Corporation | Arquivos miscelâneas | MSIL Assembler Input File | Fortran | IBM |
| .ILV | IBM Cognos | Arquivos de dados | ILOG File | ILOG CPLEX Optimization Studio | IBM |
| .IMP | Lotus Software | Arquivos de planilha | Improv Spreadsheet File | Lotus 1-2-3 | IBM |
| .INN | Micro Focus International plc | Arquivos miscelâneas | Micro Focus COBOL/2 Overlay File | IBM COBOL | IBM |
| .IRL | IBM | Arquivos de configuração | IBM WebSphere ILOG JRules Rule File | IBM WebSphere ILOG JRules | IBM |
| .ITX | IBM | Arquivos de dados | ITX Form Template | FileNet eForms | IBM |
| .IXF | IBM | Arquivos de dados | Integration Exchange Format File | IBM DB2 | IBM |
| .KEY | Unknown Developer | Arquivos codificados | License/ Encrypted Security Key File | OS/2 | IBM |
| .KYR | IBM | Arquivos miscelâneas | Lotus Domino Key Ring File | IBM Domino | IBM |
| .L2L | IBM | Arquivos miscelâneas | IBM Voice Type Languages Addword File | IBM Voice Type | IBM |
| .L2P | IBM | Arquivos de dados | IBM Voice Type Languages Addword Data | IBM Voice Type | IBM |
| .LAC | IBM | Arquivos de dados | Cognos Local Authentication Cache | Cognos software | IBM |
| .LBR | Dag Agren, Circlesoft | Arquivos comprimidos | LU Library Archive | Lotus 1-2-3 | IBM |
| .LCC | IBM | Arquivos de dados | IBM Voice Type Languages Newuser File | IBM Voice Type | IBM |
| .LSQ | IBM | Arquivos de dados | IBM Voice Type Languages Addword Data | IBM Voice Type | IBM |
| .LSS | IBM | Arquivos de desenvolvedor | LotusScript Source Code | IBM Domino | IBM |
| .LTM | IBM | Arquivos de dados | IBM Lotus Forms Form | IBM Lotus Forms Viewer | IBM |
| .LWD | EditShare | Arquivos de dados | Lightworks Data File | Lotus 1-2-3 | IBM |
| .LWP | IBM | Arquivos de Texto | Lotus Word Pro Document | IBM Lotus Word Pro | IBM |
| .LX | IBM | Arquivos de configuração | LPEX Customization Command Profile File | LPX Editor | IBM |
| .M2C | IBM | Arquivos de dados | IBM Voice Type Languages Newuser File | IBM Voice Type | IBM |
| .M3I | IBM | Arquivos de dados | IBM Voice Type Languages Newuser File | IBM Voice Type | IBM |
| .M4C | IBM | Arquivos de dados | IBM Voice Type Languages Newuser File | IBM Voice Type | IBM |
| .MAR | Microsoft Corporation | Arquivos de banco de dados | Microsoft Access Report | WebSphere Business Modeler | IBM |
| .MAS | Image Space Incorporated | Arquivos de jogos | rFactor Track File | Lotus Freelance Graphics | IBM |
| .MBOX | Unknown Developer | Arquivos de dados | E-mail Mailbox | IBM Lotus Notes | IBM |
| .MDC | IBM | Arquivos de dados | Multi Dimension Cube File | Cognos software | IBM |
| .MDL | MathWorks | Arquivos de dados | MathWorks Simulink Model | Rational Rose | IBM |
| .MDX | Disc Soft Ltd. | Arquivos de imagem de disco | Extended Media Descriptor File | Rational XDE | IBM |
| .MLB | Avanquest Software | Arquivos de dados | MyLabel Designer Deluxe Project File | IBM Lotus Symphony | IBM |
| .MOD | Open Source | Arquivos de áudio | Amiga Music Module File | Fortran | IBM |
| .MSG | Microsoft Corporation | Arquivos de Texto | Saved Email Message | OS/2 | IBM |
| .MVR | IBM | Arquivos Web | IBM HotMedia Multimedia File | HotMedia | IBM |
| .MWP | IBM | Arquivos de Texto | Lotus Word Pro SmartMaster File | IBM Lotus Word Pro | IBM |
| .NDC | IBM | Arquivos de configuração | Personal Communications Settings File | IBM Personal Communications | IBM |
| .NDK | IBM | Arquivos de dados | Lotus Notes Design Elements File | IBM Lotus Notes | IBM |
| .NDL | IBM | Arquivos miscelâneas | Lotus Notes Doclink File | IBM Lotus Notes | IBM |
| .NIX | IBM | Arquivos de dados | Rational XDE Data | Rational Rose | IBM |
| .NLO | IBM | Arquivos de dados | Lotus Notes Linked Object | IBM Lotus Notes | IBM |
| .NRF | The Neat Company | Arquivos de dados | Neat Document Folder File | IBM Lotus Notes | IBM |
| .NS3 | IBM | Arquivos de banco de dados | Lotus Notes 3 Database | IBM Lotus Notes | IBM |
| .NS4 | IBM | Arquivos de banco de dados | Lotus Notes 4 Database | IBM Lotus Notes | IBM |
| .NSF | Unknown Developer | Arquivos de áudio | NES Sound Format File | IBM Lotus Notes | IBM |
| .NSG | IBM | Arquivos de banco de dados | Lotus Notes Database | IBM Lotus Notes | IBM |
| .NTF | Open Source | Arquivos de fonte | Windows Font File | IBM Lotus Notes | IBM |
| .NTS | IBM | Arquivos de configuração | Lotus Notes Traveler Server Config File | IBM Notes Traveler | IBM |
| .OB | Innoshock | Arquivos miscelâneas | Orbit Downloader Incomplete Download | IBM LinkWay | IBM |
| .ODT | Oracle Corporation | Arquivos de Texto | OpenDocument Text Document | IBM Lotus Notes | IBM |
| .ODZ | IBM | Arquivos de dados | IBM OpenDoc Editor Package | OpenDoc | IBM |
| .OND | IBM | Arquivos de dados | Lotus Notes Encapsulated Memo File | IBM Lotus Notes | IBM |
| .OR2 | IBM | Arquivos de dados | Lotus Organizer 2 File | IBM Lotus Organizer | IBM |
| .OR3 | IBM | Arquivos de dados | IBM Lotus Organizer 97 File | IBM Lotus Organizer | IBM |
| .OR4 | IBM | Arquivos de dados | IBM Lotus Organizer 97 GS File | IBM Lotus Forms Viewer | IBM |
| .OR5 | IBM | Arquivos de dados | Lotus Organizer 5 File | IBM Lotus Organizer | IBM |
| .OR6 | IBM | Arquivos de dados | Lotus Organizer Data | IBM Lotus Organizer | IBM |
| .ORG | IBM | Arquivos de dados | Lotus Organizer File | IBM Lotus Organizer | IBM |
| .P1C | IBM | Arquivos miscelâneas | IBM Voice Type Language Newuser File | IBM Embedded ViaVoice | IBM |
| .P1I | IBM | Arquivos miscelâneas | IBM Voice Type Language Newuser File | IBM Embedded ViaVoice | IBM |
| .P2C | IBM | Arquivos de dados | IBM Voice Type Languages Newuser File | IBM Voice Type | IBM |
| .PCJ | IBM | Arquivos Gráficos | IBM LinkWay Graphics Data | IBM LinkWay | IBM |
| .PFL | PlotSoft | Arquivos de layout de página | PDFill Project File | Lotus 1-2-3 | IBM |
| .PHD | CyberLink | Arquivos de dados | PhotoDirector Project File | HeapRoots | IBM |
| .PKX | IBM | Arquivos de dados | Rational XDE Data | Rational Rose | IBM |
| .PLI | IBM | Arquivos de desenvolvedor | PL/I Source Code File | PL/I for VSE/ESA | IBM |
| .PLZ | IBM | Arquivos Gráficos | Lotus Freelance Presentation | Lotus Freelance Graphics | IBM |
| .POR | IBM | Arquivos de dados | SPSS Portable File | IBM SPSS | IBM |
| .POS | Trimble Inc. | Arquivos de dados | Trimble Position File | IBM Lotus Notes | IBM |
| .POTX | Microsoft Corporation | Arquivos de dados | PowerPoint Open XML Presentation Template | IBM Lotus Symphony | IBM |
| .PPR | IBM | Arquivos de dados | Cognos PowerPlay Report File | Cognos PowerPlay | IBM |
| .PPT | Microsoft Corporation | Arquivos de dados | PowerPoint Presentation | IBM Lotus SmartSuit | IBM |
| .PPX | Serif | Arquivos de layout de página | Serif PagePlus Template File | Cognos PowerPlay | IBM |
| .PRC | Adobe Systems Incorporated | Arquivos 3D | Product Representation Compact File | Rational Rose | IBM |
| .PRF | Microsoft Corporation | Arquivos de configuração | Outlook Profile File | FileNet eForms | IBM |
| .PRN | Various Developers | Arquivos de layout de página | HP PCL Printer Output | Lotus 1-2-3 | IBM |
| .PRP | IBM | Arquivos de dados | Rational Model Properties File | IBM Rational Rose development software | IBM |
| .PRU | IBM | Arquivos de dados | IBM Tivoli Storage Manager Pruned Entry Data | Tivoli Storage Manager | IBM |
| .PRZ | IBM | Arquivos de dados | Freelance Graphics Presentation File | Freelance Mobile Screen Show Player | IBM |
| .PSG | IBM | Arquivos de layout de página | Page Segment File | AFP Workbench Viewer | IBM |
| .PTL | IBM | Arquivos de desenvolvedor | Rational Rose Petal File | IBM Rational Rose development software | IBM |
| .PTY | IBM | Arquivos de desenvolvedor | Rational Property Set | Rational Rose | IBM |
| .PYI | IBM | Arquivos de dados | IBM Cognos 7 File | IBM Cognos Business Intelligence | IBM |
| .QF | Nokia | Arquivos de configuração | Nokia (Ovi) Maps Version Data | Fortran | IBM |
| .QMF | IBM | Arquivos de banco de dados | IBM Lotus Approach Database Query | Lotus Approach | IBM |
| .QPR | Microsoft Corporation | Arquivos de desenvolvedor | FoxPro Generated Query Program | OS/2 | IBM |
| .QST | Synergy Software | Arquivos de dados | KaleidaGraph Style File | IBM Lotus Word Pro | IBM |
| .QUT | IBM | Arquivos de dados | IBM Voice Type Languages Vocable File | IBM Voice Type | IBM |
| .RBC | IBM | Arquivos de desenvolvedor | Rembo-C Script | Tivoli Provisioning Manager | IBM |
| .RBX | IBM | Arquivos executáveis | Rembo-C Compiled Script | Tivoli Provisioning Manager | IBM |
| .RDC | IBM | Arquivos de dados | IBM Voice Type Languages Scripts Data File | IBM Voice Type | IBM |
| .RI | IBM | Arquivos de dados | IBM Lotus 1-2-3 File | Lotus 1-2-3 | IBM |
| .RIO | IBM | Arquivos de sistema | IBM AIX System Data | IBM AIX | IBM |
| .RIP | IBM | Arquivos de dados | Lotus Notes Error File | IBM Lotus Notes | IBM |
| .ROS | Jon Taylor | Arquivos de jogos | BattleScribe Roster Editor File | IBM Lotus Notes | IBM |
| .RUP | IBM | Arquivos de dados | IBM Rational Unified Process Data | Rational Method Composer | IBM |
| .SAM | Microsoft Corporation | Arquivos de Texto | LMHOSTS Sample File | IBM Lotus Word Pro | IBM |
| .SAV | Nintendo | Arquivos de jogos | Saved Game File | IBM SPSS | IBM |
| .SBS | Allegorithmic | Arquivos de configuração | Substance Package | IBM SPSS | IBM |
| .SDP | Oracle Corporation | Arquivos de dados | StarOffice Presentation File | IBM Storyboard | IBM |
| .SDT | Intuit, Inc. | Arquivos de dados | QuickBooks Data File | Rational XDE | IBM |
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