| .001 | Smith Micro Software | File backup | Split Archive File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .002 | Various Developers | File backup | Split Archive Part 2 File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .003 | Welltek Software | File backup | Split Archive Part 3 File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .004 | SourceForge | File compressi | Compressed File From A Multi-volume Archive (part 4) | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .005 | bhv | File di dati | Winfunktion Mathematik V8.0 Julia Fractal File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .006 | bhv | File di dati | Winfunktion Mathematik V8.0 Julia Fractal File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .007 | bhv | File di dati | Winfunktion Mathematik V8.0 Julia Fractal File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .008 | ESRI (Environmental Systems Research Institute) | File di GIS | International S-57 Hydrographic Data Electronic Navigation Chart | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .009 | bhv | File di dati | Winfunktion Mathematik V8.0 Julia Fractal File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .010 | bhv | File di dati | Winfunktion Mathematik V8.0 Julia Fractal File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .2D | Archway Systems | File di CAD | VersaCAD 2D Drawing File | Amapi 3D | Smith Micro Software |
| .A3D | AlternativaPlatform | File 3D | Alternativa Player 3D Export File | Amapi 3D | Smith Micro Software |
| .ANIME | Smith Micro Software | File di dati | Anime Studio Document | Smith Micro Moho Debut 12 | Smith Micro Software |
| .APK | Google | File compressi | Android Package File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .APPLE | Apple | File di dati | Apple AppleSingle Data File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .ARC | Symantec Corporation | File backup | Norton Backup Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .ARJ | Robert K. Jung | File compressi | ARJ Compressed File Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .B2A | Smith Micro Software | File codificati | Btoa Encoded File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .B64 | Smith Micro Software | File compressi | Base64 MIME-Encoded File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .BHX | Open Source | File codificati | BinHex Encoded File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .BIN | Unknown Developer | File con immagini disco | Binary Disk Image File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .BTOA | Smith Micro Software | File codificati | Binary-to-ASCII Encoded File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .BZ | Smith Micro Software | File compressi | Bzip Compressed File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .BZ2 | Julian Seward | File compressi | Bzip2 Compressed File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .BZIP2 | Julian Seward | File compressi | Bzip2 Compressed Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .CAB | Microsoft Corporation | File di sistema | Windows Cabinet File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .CB7 | Smith Micro Software | File compressi | Comic Book 7-Zip Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .CBR | Unknown Developer | File compressi | Comic Book RAR Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .CBT | Various Developers | File compressi | Comic Book TAR File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .CBZ | Open Source | File 3D | Comic Book Zip Archive File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .CM2 | Smith Micro Software | File 3D | Poser Camera Set File | Smith Micro Poser | Smith Micro Software |
| .CPT | Corel | File con immagini raster | Corel Photo-Paint Image | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .CR2 | Canon Inc. | File Videocamera non elaborati | Canon Digital Camera Raw Image File | Poser | Smith Micro Software |
| .CRZ | Smith Micro Software | File 3D | Compressed Poser Character Rigging File | Smith Micro Poser | Smith Micro Software |
| .CST | Smith Micro Software | File con layout di pagina | Manga Studio Story File | Manga Studio | Smith Micro Software |
| .EFW | Corel | File compressi | Renamed Zip Or Executable File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .ENC | Smith Micro Software | File codificati | Encoded Data File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .FC2 | Smith Micro Software | File 3D | Poser Face Pose File | Smith Micro Poser | Smith Micro Software |
| .FMC | Interscape | File di dati | FormConnect Form File | MotionArtist | Smith Micro Software |
| .FMD | Smith Micro Software | File di dati | MotionArtist Document File | MotionArtist | Smith Micro Software |
| .GTAR | Free Software Foundation | File di dati | GNU Tar Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .GZ | GNU Project | File compressi | Gnu Zipped Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .HBX | Open Source | File codificati | BinHex Encoded File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .HD2 | Smith Micro Software | File 3D | Poser Hand Pose File | Poser | Smith Micro Software |
| .HEX | Intel Corporation | File sviluppatore | Hexadecimal Source File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .HFX | Smith Micro Software | File di dati | HotFax Data File | HotFax | Smith Micro Software |
| .HR2 | Smith Micro Software | File 3D | Poser Hair File | Smith Micro Poser | Smith Micro Software |
| .HRZ | Unknown Developer | File grafici | Slow Scan TeleVision File (SSTV) | Poser | Smith Micro Software |
| .LHA | WinAbility Software | File compressi | LHARC Compressed Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .LHARC | WinAbility Software | File compressi | LHARC Compressed Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .LT2 | Smith Micro Software | File 3D | Poser Light Set File | Smith Micro Poser | Smith Micro Software |
| .LWO | NewTek | File 3D | LightWave 3D Object File | Poser | Smith Micro Software |
| .LZH | Various Developers | File compressi | LZH Compressed File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .LZMA | Igor Pavlov | File compressi | LZMA Compressed File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .MAP | id Software | File di giochi | Quake Engine Map File | Poser | Smith Micro Software |
| .MC5 | Smith Micro Software | File 3D | Poser 5 Material File | Smith Micro Poser | Smith Micro Software |
| .MC6 | Smith Micro Software | File grafici | Poser 6 Material File | Poser | Smith Micro Software |
| .MCWORLD | Smith Micro Software | File di giochi | Minecraft World Backup File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .MIM | Internet Engineering Task Force | File codificati | Multi-Purpose Internet Mail Message File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .MIME | Various Developers | File codificati | Multi-Purpose Internet Mail Extension | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .MME | Smith Micro Software | File codificati | Multipurpose Internet Mail Extensions | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .MOHO | Smith Micro Software | File di dati | Moho Animation Project | Smith Micro Moho Debut 12 | Smith Micro Software |
| .MOR | Corel | File di dati | Corel Shared Writing Tools Data | Poser | Smith Micro Software |
| .OBZ | Smith Micro Software | File 3D | Compressed 3D Object File | Poser | Smith Micro Software |
| .PAK | Unknown Developer | File di giochi | Video Game Package | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .PET | Larry Short, Mick Amadio and Puppy community | File compressi | Puppy Linux Install Package | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .PF | Smith Micro Software | File compressi | Private File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .PIT | Samsung Electronics | File di sistema | Samsung Phone Firmware File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .PIZ | Winrar | File compressi | Zipped File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .PMD | Adobe Systems Incorporated | File con layout di pagina | PageMaker Document | Poser | Smith Micro Software |
| .PP2 | Pingman Tools | File di dati | PingPlotter Data File | Smith Micro Poser | Smith Micro Software |
| .PPZ | Smith Micro Software | File 3D | Compressed Poser Prop File | Smith Micro Poser | Smith Micro Software |
| .PZ2 | Smith Micro Software | File 3D | Poser Pose File | Smith Micro Poser | Smith Micro Software |
| .PZ3 | Smith Micro Software | File 3D | Poser Scene File | Poser | Smith Micro Software |
| .PZZ | Smith Micro Software | File 3D | Poser Compressed Scene File | Poser | Smith Micro Software |
| .R00 | Rocky Sand Studio | File compressi | WinRAR Compressed Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .R06 | Eugene Roshal | File compressi | Split Multi-volume RAR Compressed File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .R07 | Eugene Roshal | File compressi | Split Multi-volume RAR Compressed File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .R09 | Eugene Roshal | File compressi | Split Multi-volume RAR Compressed File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .R30 | Eugene Roshal | File compressi | WinRAR Split Archive Part 30 | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .R36 | Eugene Roshal | File compressi | Split Multi-volume RAR Compressed File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .R50 | Eugene Roshal | File compressi | Split Multi-volume RAR Compressed File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .RAR | Rocky Sand Studio | File compressi | WinRAR Compressed Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .RSR | Smith Micro Software | File con immagini raster | Poser Model Preview File | Smith Micro Poser | Smith Micro Software |
| .S07 | Eugene Roshal | File compressi | Split Multi-volume RAR Compressed File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .S09 | Eugene Roshal | File compressi | Split Multi-volume RAR Compressed File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .S7Z | Igor Pavlov | File compressi | 7-Zip Compressed File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .SEA | Smith Micro Software | File compressi | Self-Extracting Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .SIT | Smith Micro Software | File compressi | StuffIt Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .SITX | Smith Micro Software | File compressi | StuffIt X Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .SMV | Smith Micro Software | File video | VideoLink Mail Video File | Smith Micro Videolink Pro | Smith Micro Software |
| .SOW | Interplay Entertainment | File di giochi | Descent ARJ Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .TAR | Jean-loup Gailly and Mark Adler | File di dati | Consolidated Unix File Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .TAZ | Smith Micro Software | File compressi | Tar Zipped File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .TBZ2 | Winrar | File compressi | Tar BZip 2 Compressed File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .TG | Julian Gabriel Casadesus and Others | File audio | TuxGuitar Document | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .TGZ | Various Developers | File compressi | Gzipped Tar File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .TIG | Texas Instruments, Inc. | File backup | TI Connect Backup File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .TZ | Smith Micro Software | File compressi | Compressed Tar Archive | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .U3D | 3D Industry Forum | File 3D | Universal 3D File | Smith Micro Poser | Smith Micro Software |
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