| !ws | WordStar 2000 Temporary File |
| 123dx | Autodesk 123D Design Model |
| 1sp | Microsoft OneNote 2010 Mobile Document |
| 2cd | DoubleCAD Document |
| 2d | Cadwork 2D Drawing |
| 2d | VersaCAD 2D Drawing |
| 2dl | ArchiCAD 2D Lines Data |
| 3d | CAD-3D Model |
| 3d | Cadwork 3D Drawing |
| 3da | ArtCAM Pro 3D Assembly Data |
| 3db | 3DMark Report Database |
| 3dd | Cadmatic 3DD Model |
| 3df | Informative Graphics 3D Format Document |
| 3dg | 3D Grapher Document |
| 3di | Cadence Allegro 3D Model |
| 3dl | LightConverse 3D Scene |
| 3dm | OpenNURBS 3D Model |
| 3dmf | QuickDraw 3D Metafile |
| 3dml | Flatland 3DML Document |
| 3ds | Autodesk 3D Studio Scene |
| 3dt | 3D Topicscape Document |
| 3dx | Rhino 3D Model |
| 3dxml | 3D XML Document |
| 3ko | NGRAIN SDK 3D Data |
| 3mf | 3D Manufacturing Format Document |
| 3ml | SimStudio 3D Model |
| 3pi | 3rd PlanIt Data |
| 3tf | Crystal Reports Chart Template |
| 3w | XYZware 3D Document |
| 3wn | XYZware Nobel 3D Model |
| 4dse | 4D Database for Mac Quick Report Document |
| 4dv | 4DIM Interactive Animation |
| 4w6 | 4D Write Document |
| 4wp | 4D Write Pro Document |
| 4wt | 4D Write Template |
| 602 | Text602 Document |
| a2l | ASAP2 ECU Description |
| a3d | Amapi Designer 3D Model |
| a4d | 4DIM Model Animation |
| aad | Atlantis Word Processor Document Backup |
| aaf | Advanced Authoring Format File |
| abc | Business Card Maker Document |
| abc | Micrografx ABC FlowCharter 6 Document |
| abd | Worksheet Crafter Document |
| abk | Ability Write Document Backup |
| abs | Abs Spreadsheet |
| abt | Braille2000 Annotated Braille Text |
| abt | ED-IT PC AsIs Braille Text File |
| abw | AbiWord Document |
| ac3d | AC3D Model |
| ac5 | ArtCut 5 Document |
| ac6 | ArtCut 6 Document |
| accd | Microsoft Access 2007 Database |
| accdb | Microsoft Access 2007 Database |
| accdc | Microsoft Access 2007 Signed Package |
| accde | Microsoft Access 2007 Executable |
| accdr | Microsoft Access 2007 Run-time |
| accdt | Microsoft Access 2007 Database Template |
| accdw | Microsoft Access 2007 Database Link |
| accfl | Microsoft Access Field Template |
| accft | Microsoft Access 2007 Data Type Template |
| acp | Macromedia Action! Document |
| act | Macromedia Action! Template |
| ad65 | Adobe PageMaker 6.5 for Mac Document |
| adb | Ability Database Document |
| add | Alphacam Diecut Drawing |
| ade | Microsoft Access Project Extension |
| adf | Active-HDL Design Document |
| adf | ARIS Express Document |
| adf | I-DEAS Associated Data |
| adoc | AsciiDoc File |
| adoc | Authentica Secure Office Protected Word Document |
| ados | ADOS Compound Document |
| adox | ActivDox Document |
| adsk | Autodesk Exchange File |
| ad_asm | Alibre Design CAD Assembly Document |
| ad_bom | Alibre Design Bills of Material Data |
| ad_drw | Alibre Design 3D CAD Drawing |
| ad_prt | Alibre Design CAD Part Document |
| ae | SoftQuad Author/Editor Document |
| aed | Alphacam Wire EDM Drawing |
| aeh | EBooksWriter E-book Document |
| af2 | Micrografx ABC FlowCharter 2 Document |
| af3 | Micrografx ABC FlowCharter 3 Document |
| afd | Alphacam Flame Drawing |
| afdesign | Affinity Design Document |
| aff | AnyForm Form Document |
| aff | BART Animated File Format |
| afpub | Affinity Publisher Document |
| aft | AnyForm Template |
| aftemplate | Affinity Design Template |
| agd1 | Adobe FreeHand for Mac Drawing |
| agn | Psion Series 3 Agenda Document |
| agp | Aspen Graphics Workspace |
| agz | AggFlow Aggregate Plant Flow Diagram |
| ahf | Applet Headline Factory Document |
| aht | AH Note Text Document |
| aib | ArcInfo Binary Coverage |
| aig | Abracadata Drawing |
| ait | Adobe Illustrator Template |
| ajd | Alphacam Water Jet Drawing |
| ak | TracerCAD File |
| al3d | Alicona Imaging AL3D File |
| ala | Alan IF Document |
| ald | Alphacam Laser Drawing |
| ald5 | Adobe PageMaker 5 for Mac Document |
| amd | Alphacam 2D/3D Mill Drawing |
| amh | AudioMulch Document |
| amt | Artista Embroidery Template |
| amt50 | Bernina Embroidery Software v5.0 Template |
| amt60 | Bernina Embroidery Software v6.0 Template |
| an8 | Anim8or Document |
| anb | i2 Analyst's Notebook Data |
| android | Android Related Readme |
| anh | Adobe Project ROME File |
| ans | ANSI Art Text |
| antmpl | Adobe Edge Animate Template |
| ao | ActionOutline Outline |
| apa | AlfaPad Notes Organizer Document |
| apcdoc | Ashampoo Photo Commander Document |
| apd | Alphacam Punch Drawing |
| apd | Arcplan Enterprise Document |
| apib | API Blueprint Document |
| apm | Adobe Persuasion Metafile |
| apo | Abacre Paperless Office Portable Document |
| appt | Authentica Secure Office Protected PowerPoint Document |
| apr | Lotus Approach 97 Document |
| apt | Lotus Approach Data View |
| apxl | iWork Keynote XML Presentation |
| ard | Alphacam Router Drawing |
| ard | Esko ArtiosCAD Document |
| ark | OpenBook Document |
| arr | Remedy ARS Report |
| art | ArtCAM Model File |
| art | Artista v4 Embroidery Data |
| art3 | Art Text Drawing |
| art6 | Articulate Presenter Online Document |
| article | Twixl Publisher Article |
| arx | Artista Cross Stitch Embroidery Data |
| as5 | CivilCAD v5 ASCII Document |
| asc | ASCII Armored GPG/PGP File |
| asd | Alphacam Stone Drawing |
| asd | Microsoft Word AutoRecovery File |
| ase | Autodesk 3D Studio ASCII Scene Export |
| aseprite | Aseprite Sprite Data |
| asm | Solid Edge Assemblies Document |
| asp | ASAP WebShow Presentation |
| asp | Astound Presentation |
| assbin | Allegorithmic Substance Painter Scene |
| ast | Ability Spreadsheet Template |
| ast | Astound Media Data |
| ast | ClarisWorks Assistant |
| astx | Adobe Story Exported Script |
| asy | Asymptote Document |
| at2 | Aldus Persuasion v2 Template |
| at65 | Adobe PageMaker for Mac 6.5 Template |
| atd | Alphacam Lathe Drawing |
| atl | IR Prognosis Atlas Document |
| atom | Atom Syndication Format File |
| atw | AnyTime Organizer Deluxe Document |
| av | Final Draft AV v1 Document |
| avery | Avery Design and Print Online Label |
| aw | Applixware Words Document |
| awd | Ability Draw Document |
| awd | Microsoft Fax Image |
| awg | Ability Draw Vector Graphic |
| awp | Ability Write Template |
| aws | Ability Spreadsheet Document |
| awss | Microsoft Works for Mac Spreadsheet |
| awt | AbiWord Template |
| aww | Ability Write Document |
| awwp | Microsoft Works for Mac Document |
| ax2 | Apex Sketch v2 Document |
| ax3 | Apex Sketch v3 Document |
| ax4 | Apex Sketch v4 Document |
| ax5 | Apex Sketch v5 Document |
| axls | Authentica Secure Office Protected Excel Document |
| axz | Apex Sketch v6 Document |
| b | IRIS Editor Shortened Format File |
| b4u | docPointer Visual ReadMe Document |
| bak | Canvas Drawing Backup |
| bakx | MakeMusic Finale Notation Backup |
| bamboopaper | Wacom Bamboo Paper Document |
| ban | Broderbund PrintMaster Banner |
| bax | Bluebeam PDF Revu Markup XML |
| bbcd | BobCAD-CAM Document |
| bbdoc | Buildbox Document |
| bbe | Brainbloom Document Exchange File |
| bbl | BibTeX Bibliographic Reference |
| bbs | BBS Directory List |
| bbxt | BBEdit Document |
| bc5 | Impression Document |
| bcc | Calendar Creator v7 Document |
| bcd | OfficePrinter Label Document |
| bcf | Belltech Business Card Designer Pro Document |
| bcn | Business Card Pro Design |
| bcp | Business Card Designer Plus Document |
| bcsv | Binary CSV Data |
| bdb | Microsoft Works Database Backup |
| bdc | West Point Bridge Designer Document |
| bdl | PTC Creo Bundle File |
| bean | Bean Rich Text Document |
| bfc | Windows 95 Briefcase Document |
| bff | WorldToolKit Binary NFF Data |
| bfx | Bluebeam PDF Revu Exchange XML |
| bgcf | Belltech Greeting Card Designer Document |
| bgv | BonanzaGraf Financial Presentation |
| bib | BibTeX Document |
| big5 | Chinese Text Document |
| bimx | ArchiCAD BIMx Document |
| biot | BiotSavart Magnetic Design Data |
| bip | KeyShot Scene |
| biz | Broderbund PrintMaster Business Card |
| bjo | TabRite Tablature |
| bjt | LTspice Bipolar Design |
| bk | Adobe FrameMaker Book Document |
| bk! | Corel WordPerfect Document Backup |
| bks | Microsoft Works Spreadsheet Backup |
| bll | Binary Lasergraphics Language Document |
| blogthis | Windows Live Writer Data |
| blurb | BookWright Document |
| bmf | BrainMine Mind Map Document |
| bml | Braille2000 Braille Data |
| bmm | FX AccuCharts Market Watch Document |
| bmml | Braille Music Markup Language File |
| bn | NewsRoom Document |
| bna | Barna Word Processor Document |
| bnk | ExamView Question Bank |
| bnr | Banner Mania Banner |
| bns | BinNews BNS Message-Id Data |
| bobo | ClarisWorks Data |
| boc | EasyWord Big Document |
| book | Adobe FrameMaker Book |
| bop | Business Office Pro Document |
| bpdx | Adobe Acrobat Batch PDX Data |
| bpf | Baan ERP Document |
| bpmn | Business Process Model and Notation Document |
| bps | Microsoft Works Document Backup |
| bpt | IBM InfoSphere Blueprint Director Document |
| br3 | Bryce 3 Scene |
| br4 | Bryce 4 Scene |
| br5 | Bryce 5 Scene |
| br6 | Bryce 6 Scene |
| br7 | Bryce 7 Scene |
| brd | Cadence Allegro PCB Layout |
| brd | EAGLE PCB Layout |
| brd | KiCad Board Layout File |
| brep | Boundary Representation File |
| brf | Braille Formatted File |
| brh | Baraha Document |