| jttc | Ichitaro Compressed Template |
| jtw | Ichitaro 5.0 Template |
| jtx | Jrju Text File |
| juw | Ichitaro 6.0 Template |
| jvw | Ichitaro 7.0 Template |
| jvx | JavaView JVX Geometry File |
| jw | JustWrite Document |
| jwc | Jw_cad for DOS Document |
| jwl | Roxio Jewel Case Creator Document |
| jwrt | JoliWrite Document |
| jww | Jw_cad for Windows Document |
| jzz | Lotus Jazz Spreadsheet Document |
| k3d | K-3D Document |
| karbon | KDE Karbon Document |
| kcf | KeyCAD Drawing Document |
| kdc | Kwalitan Document |
| kdf | Kinko's Document Format File |
| kes | Kurzweil 3000 Document |
| key | iWork Keynote Presentation |
| key-tef | iWork Keynote iCloud Presentation |
| kfa | Serif DrawPlus Key-frame Animation |
| kfi | 3D Forgastest Editor Data |
| kfl | Microsoft Outlook Known Feed List |
| kfm | KEY Form Designer Form Document |
| kht | Nonosoft KHOT Document |
| kia | Kidspiration Document |
| kicad_pcb | KiCad PCB Design Document |
| kid | Kidspiration Document |
| kil | Kontour Drawing Document |
| kit | 20-20 Design File |
| kmc | Kinemac Animation |
| kml | Keyhole Markup Language File |
| kmt | Kermeta Document |
| kmz | Compressed KML Data |
| kni | Raynen-Qili KnitCAD Document |
| knk | KNK Studio Cutting Document |
| kns | Raynen-Qili Shoe Design System Document |
| knt | iWork Keynote Note Document |
| kos | MicroType Pro Document |
| kpp | Kid Pix Presentation |
| kppx | Keypoint Presentation Document |
| kpr | KPresenter Presentation |
| kpt | KPresenter Presentation Template |
| kpx | Kid Pix Picture |
| krs | GEUS Document |
| ks3 | 3D Forgastest Editor Object |
| ksp | Calligra Sheets Document |
| ksw | Kepler Workflow Document |
| kte | FoilMaker Kite Design |
| kth | iWork Keynote Theme |
| kvtml | KWordQuiz Document |
| kw3 | KanjiWORD 3 Document |
| kwd | KWord Document |
| kwl | Kamban Word Processor Lite Document |
| kwp | Kamban Word Processor Document |
| l3b | SR 3D Builder Model |
| l9 | Gargoyle Level 9 Document |
| laccdb | Microsoft Access 2007 Database Lock |
| law | eLawForms Form Document |
| lay | Sprint-Layout Document |
| lay6 | Sprint-Layout v6 Document |
| lbi | Dreamweaver Library |
| lbl | Broderbund PrintMaster Label |
| lbl | NiceLabel Label Template |
| lbl | P-touch Editor Document |
| lbx | P-touch Editor v5 Document |
| lbz | Leibniz Document |
| lch | IBM Works for OS/2 Chart |
| lcw | Lucid 3-D Spreadsheet |
| ldf | Luratech Portable Document |
| ldr | LDraw Model File |
| leg | LEGO CAD Model Data |
| let | Broderbund PrintMaster Letterhead |
| lgf | Imagine LogoMotion Image |
| lgx | Acornsoft Logistix Spreadsheet |
| lhd | Label Home Document |
| lhp | Lua Help Pages Document |
| li3d | Live Interior 3D Bundle Document |
| linux | Linux related Readme Text |
| liquid | Shopify Liquid Template |
| lizd | Live Interior 3D Compressed Document |
| llb | Cadence OrCAD Layout |
| llg | LADSIM Ladder Logic Diagram |
| lmf3 | PowerMark Fly Laser Document |
| lmk | Sothink Logo Maker Logo |
| lms | LenMus Score Document |
| lmts | Pulsar LMTools Model |
| ln3 | DVILN03 Output File |
| lnb | PRO Landscape Planner Design Backup |
| lnf | PRO Landscape Planner Design |
| loe | LaTeX List of Theorems |
| logicly | Logicly Circuit Data |
| lot | LaTeX List of Tables |
| lox | Therion 3D Model |
| lp2 | iLEAP Document |
| lpd | Label Designer Plus Document |
| lpd | Lecturnity Multimedia Presentation Document |
| lpt | LogPlot Document |
| lrp | IBM Works for OS/2 Report |
| ls10 | Lumion v10 3D Scene |
| ls10s | Lumion v10 Student Version Scene |
| ls8 | Lumion v8 Scene |
| ls9 | Lumion v9 3D Scene |
| lsd | Lecturnity Source Document |
| lsg3x | LinSig 3 Document |
| lss | Legato Spreadsheet |
| lt3 | Livetext Text Document |
| ltdoc | LiquidText Document |
| ltm | IBM Lotus Forms Document |
| ltr | IBM Lotus Forms Letter Document |
| luf | Lipikar Uniform Format Document |
| lums | SAP Lumira Document |
| lumx | SAP Lumira Discovery 2.0 Document |
| lvw | Livewire Document |
| lwc | Legacy Charting Chart Document |
| lwd | LotusWorks Text Document |
| lwl | DYMO Label Document |
| lwl | Lightwright Printed Paperwork Formatting Instructions |
| lwo | Lightwave 3D Object |
| lwp | IBM Works for OS/2 Document |
| lwp | Lotus Word Pro Document |
| lws | Lightwave 3D Scene |
| lwt | DYMO Label Template |
| lxe | Luxology Modo 3D Scene |
| lxf | LEGO Digital Designer Model |
| lxo | Luxology Modo 3D Image |
| ly | GNU Lilypond Document |
| ly+ | DataCAD Plus Layer Data |
| lyc | bestIMAGE Compressed Design |
| lyr | bestIMAGE Layer Data |
| lyt | Proteus Electronics Layout |
| lyx | LyX Document |
| lyz | LaserDRW Document |
| m15 | thinEdge M15 File |
| ma | Autodesk Maya 3D ASCII Scene |
| ma | Mathematica ASCII File |
| ma2 | Winplot Mapping Document |
| maca | MacWrite Document |
| maf | Microsoft Access Form |
| mag | Microsoft Access Diagram Shortcut |
| magic | SlideMagic Presentation Document |
| maj | Autodesk Fabrication Job |
| makerbot | MakerBot 3D Print Document |
| mam | Microsoft Access Macro |
| man | Unix Manual Page |
| manu | Lotus Manuscript v1 Document |
| maple | Maple Workbook Document |
| maq | Microsoft Access Query |
| mar | Mariner Calc Document |
| mar | Microsoft Access Report |
| marc | MARC Document |
| mars | Adobe MARS Document |
| mas | Microsoft Access Stored Procedure |
| mass | MASS-11 Text Document |
| mat | Microsoft Access Table |
| mau | Microsoft Access Function Shortcut |
| mav | Microsoft Access View Shortcut |
| maw | Microsoft Access Data Access Page |
| max | Autodesk 3D Studio Max Scene |
| max | Cadence OrCAD Max Layout |
| max | Microsoft Creative Writer Document |
| max | OmniPage Scanned Document |
| mb | Autodesk Maya 3D Binary Scene |
| mb | Mathematica Binary File |
| mb3 | Minimal Board Editor Document |
| mb4 | Model Builder Document |
| mbb | ManaBook Document |
| mbbk | ManaBook Book Kit |
| mbf | Microsoft Money Backup |
| mbk | SmartWare Macro Backup |
| mbxml | meBible XML File |
| mc2 | MasterCook 5 CookBook |
| mc7 | Mastercam 7 Document |
| mc8 | Mastercam 8 Document |
| mc9 | Mastercam 9 Document |
| mcbn | Microsoft Excel 4 for Mac Chart |
| mcd | Mathcad Document |
| mcd | VectorWorks Drawing Document |
| mcdx | Mathcad Prime Document |
| mcf | MasterCook CookBook File |
| mcl | VectorWorks Drawing Template |
| mcm | MacMolecule Document |
| mcpat | myriaCross Editor Design Document |
| mcr | C.a.R. Macro |
| mcs | The Only Sheet Settings Data |
| mcw | Microsoft Word for Macintosh Document |
| mcx | Mastercam X Document |
| mcx | MICRO CADAM-X/6000 Model Data |
| mcx-8 | Mastercam X8 Document |
| mcx-9 | Mastercam X9 Document |
| mcx3 | Mastercam X3 Document |
| mcx4 | Mastercam X4 Document |
| mcx5 | Mastercam X5 Document |
| mcx6 | Mastercam X6 Document |
| mcx7 | Mastercam X7 Document |
| md | Mayura Draw Document |
| md | MuseData Score |
| md60 | MacDraft 6.0 Document |
| mda | Microsoft Access Add-in |
| mdb | Microsoft Access Database |
| mdbhtml | Microsoft Access Database HTML Document |
| mdd | MacDraft Drawing Document |
| mdd | Motion Designer Document |
| mde | Microsoft Access Database |
| mdf | JetForm Design Template |
| mdh | Madhyam Document |
| mdk | Madoko Document |
| mdl | Simulink Model |
| mdlp | Simulink Protected Model |
| mdpl | MacDraw II Document |
| mdrw | MacDraw Drawing |
| mdt | Microsoft Access Add-in |
| mdz | Microsoft Access Wizard Template |
| med | MEDLINE Document |
| mell | Mellel Word Processing Document |
| mellel | Mellel Word Processor Document |
| mem | Corel WordPerfect Macro Editor Macro |
| men | MenuPro Menu Document |
| mer | Data Interchange Format |
| met | OmniPage Document |
| metastock | MetaStock Document |
| mez | MusicEase Document |
| mf1 | I-DEAS Model |
| mfp | Macromedia Flash Paper |
| mga | Manga Document |
| mge | MacGAMUT Mini Demo Data |
| mgmap | MindGenius Mind Map |
| mgmf | MindGenius Map |
| mgmt | MindGenius Template |
| mgmx | MindGenius XML Map |
| mgopml | MindGenius OPML Document |
| mgourmet | MacGourmet Deluxe Document |
| mgourmet3 | MacGourmet Deluxe 3 Document |
| mgourmet4 | MacGourmet Deluxe 4 Document |
| mgp | MagicPoint Presentation File |
| mgs | Equation Illustrator Vector Shapes |
| mgt | Musicnotes Guitar Guru Song |
| mgtpl | MindGenius Template |
| mgtx | MindGenius XML Template |
| mgx | Micrografx Designer Document |
| mht | Multipurpose Internet Mail Extension HTML |
| mhv | Husqvarna Viking MHV Embroidery |
| mhx | MakeHuman eXchange Data |
| mi | CoCreate Document |
| mic | Microsoft Image Composer File |
| mif | Adobe FrameMaker Interchange Format |
| mig | Mighty Draw Drawing |
| min | Cadence OrCAD Min Layout |
| mind | MindMeister Mindmap Document |
| minder | Minder Mind Map |