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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .JAVA | Oracle Corporation | Developer Files | Java Source Code | Apple TextEdit | Apple |
| .JFI | Joint Photographic Experts Group | Raster Image Files | JPEG File Interchange Image | Apple Photos | Apple |
| .JFIF | Unknown Developer | Raster Image Files | JPEG File Interchange Format | Apple Safari | Apple |
| .JIF | Joint Photographic Experts Group | Raster Image Files | JPEG Image | Apple Safari | Apple |
| .JMH | Unknown Developer | Raster Image Files | JPEG File Interchange Format | Apple Safari | Apple |
| .JNLP | Oracle Corporation | Web Files | Java Web Start File | Apple Pages | Apple |
| .JP2 | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Core Image File | Apple Safari | Apple |
| .JPEG | Joint Photographic Experts Group | Raster Image Files | JPEG Image | Apple Safari | Apple |
| .JPF | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | Apple QuickTime Player | Apple |
| .JPG | Joint Photographic Experts Group | Raster Image Files | JPEG Image | Apple Safari | Apple |
| .JPG2 | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | Apple QuickTime Player | Apple |
| .JPX | Embarcadero Technologies | Developer Files | JBuilder Project | Apple QuickTime Player | Apple |
| .JS | NetScape | Web Files | JavaScript File | Apple TextEdit | Apple |
| .JSCRIPT | NetScape | Web Files | JavaScript File | Apple TextEdit | Apple |
| .JSON | Mozilla | Backup Files | Mozilla Firefox Bookmarks Backup | Apple TextEdit | Apple |
| .JSP | Oracle Corporation | Web Files | Java Server Page | Safari | Apple |
| .JSPA | Xinox Software | Web Files | Java Servlet Alias | Apple Safari | Apple |
| .JTF | Various Developers | Raster Image Files | JPEG Tagged Interchange Format | Apple Preview | Apple |
| .JWK | Douglas Crockford | Encrypted Files | JSON Web Key | Apple TextEdit | Apple |
| .KCL | Nintendo | Game Files | Mario Kart Collision File | Apple TextEdit | Apple |
| .KDS | Knyzhov Dmitry | Settings Files | KD Player Skin File | Apple TextEdit | Apple |
| .KERNEL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .KEXT | Apple | System Files | Mac OS X Kernel Extension | Apple OS X | Apple |
| .KEY | Unknown Developer | Encoded Files | License/ Encrypted Security Key File | Apple Keynote | Apple |
| .KEYNOTE | Apple | Data Files | iWork Keynote '06 Presentation | Apple Keynote | Apple |
| .KIK | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .KSH | AT&T Labs | Executable Files | Unix Korn Shell Script | Apple Terminal | Apple |
| .KTH | Apple | Data Files | iWork Keynote Theme | Apple Keynote | Apple |
| .L | Johan Bontes | Data Files | Game Of Life File | Apple TextEdit | Apple |
| .LARGE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .LASSO | LassoSoft | Web Files | Lasso Database-Driven Web Page | Safari | Apple |
| .LAUNCHER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .LAY | Tecplot, Inc | Data Files | Tecplot Layout File | Apple DVD Studio Pro | Apple |
| .LAYOUT | Apple | Settings Files | Apple MainStage Layout Data | Logic Studio | Apple |
| .LDIF | Mozilla | Data Files | LDAP Data Interchange Format File | Apple Contacts | Apple |
| .LDS | GNU Project | Developer Files | Binutils LD Linker Script | Apple TextEdit | Apple |
| .LGE | Don Ho | Data Files | Log Data | Apple TextEdit | Apple |
| .LINK | Apple | Uncommon Files | iPod Link File | Apple iOS | Apple |
| .LIS | SourceForge | Text Files | SQR (Structured Query Reporting) Output File | Apple TextEdit | Apple |
| .LIST | Open Source | Data Files | APT List File | Apple TextEdit | Apple |
| .LISTING | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .LOAD | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .LOADER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .LOAN | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .LOCALSTORAGE | Data Files | WebKit Local Storage Data File | Apple Safari | Apple | |
| .LOG | Unknown Developer | Text Files | Log File | Apple TextEdit | Apple |
| .LOGO | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .LOGON | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .LOL | Apple | Developer Files | LOLCODE Source Code FIle | Apple TextEdit | Apple |
| .LP1 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .LPROJ | Apple | Developer Files | Localized Project Folder | macOS | Apple |
| .LQ | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .LRC | Various Developers | Uncommon Files | Lyrics File | Apple iTunes | Apple |
| .LRV | Konica Minolta | Data Files | Konica Minolta Data Management Software Stored File | Apple QuickTime Player | Apple |
| .LSO | Apple | Audio Files | Logic Audio Project | Apple Logic Pro | Apple |
| .LST | Unknown Developer | Text Files | Data List | Apple TextEdit | Apple |
| .LYT | Adminsoft | Data Files | Adminsoft Document Layout File | Apple TextEdit | Apple |
| .LZMA | Igor Pavlov | Compressed Files | LZMA Compressed File | Sixty Five 7zX | Apple |
| .LZZZZZZZ | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .M | MathWorks | Developer Files | MATLAB Source Code File | Apple TextEdit | Apple |
| .M15 | Moving Picture Experts Group | Video Files | MPEG Video File | Apple iTunes | Apple |
| .M1A | Open Source | Audio Files | MPEG-1 Audio File | Apple QuickTime Player | Apple |
| .M1V | Roxio | Video Files | MPEG-1 Video File | Apple QuickTime Player | Apple |
| .M21 | AXMEDIS Products and Services | Video Files | AXMEDIS MPEG-21 File | Apple QuickTime Player | Apple |
| .M2A | Unknown Developer | Video Files | MPEG-1 Layer 2 Audio File | Apple QuickTime Player | Apple |
| .M2S | Maxthon | Settings Files | Maxthon 2 Browser Skin File | Apple QuickTime Player | Apple |
| .M2V | Webteh | Video Files | MPEG-2 Packetized Elementary Stream | Apple QuickTime Player | Apple |
| .M3U | Nullsoft | Audio Files | Media Playlist File | Apple iTunes | Apple |
| .M3U8 | Various Developers | Audio Files | UTF-8 M3U Playlist File | Apple iTunes | Apple |
| .M4A | Apple | Audio Files | MPEG-4 Audio File | Apple iTunes | Apple |
| .M4B | Apple | Audio Files | MPEG-4 Audio Book File | Apple iTunes | Apple |
| .M4P | Apple | Audio Files | iTunes Music Store Audio File | Apple iTunes | Apple |
| .M4R | Apple | Audio Files | iPhone Ringtone File | Apple iTunes | Apple |
| .M4U | Open Source | Video Files | MPEG-4 Playlist | Apple QuickTime Player | Apple |
| .M4V | Apple | Video Files | iTunes Video File | Apple iTunes | Apple |
| .M75 | Moving Picture Experts Group | Video Files | MPEG Video File | Apple iTunes | Apple |
| .MAC | Apple | Raster Image Files | MacPaint Image | Apple QuickTime Player | Apple |
| .MAC2 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MACRO | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MACWRITE | Apple | Text Files | MacWrite Text Document | MacWrite | Apple |
| .MAILBOX | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MAK | Sublime HQ Pty Ltd | Developer Files | Makefile | Apple Xcode | Apple |
| .MAKEFILE | Sublime HQ Pty Ltd | Developer Files | Makefile | Apple Xcode | Apple |
| .MAN | Unknown Developer | Text Files | Unix Manual | Apple TextEdit | Apple |
| .MANIFEST | Microsoft Corporation | System Files | Windows Application Manifest File | Apple TextEdit | Apple |
| .MAPS | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MARCH | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .MARIO | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MARKDOWN | Various Developers | Developer Files | Markdown Documentation File | Apple TextEdit | Apple |
| .MBDB | Apple | Data Files | iTunes Backup Manifest Database | Apple iTunes | Apple |
| .MBL | Vernier Software & Technology | Data Files | Logger Pro Data File | Vernier Graphical Analysis | Apple |
| .MBOX | Unknown Developer | Data Files | E-mail Mailbox | Apple Mail | Apple |
| .MCWORLD | Smith Micro Software | Game Files | Minecraft World Backup File | Apple Archive Utility | Apple |
| .MD | Various Developers | Developer Files | Markdown Documentation File | Apple TextEdit | Apple |
| .MDBACKUP | Apple | Backup Files | iPhone Data Backup File | Apple iTunes | Apple |
| .MDOWN | John Gruber | Text Files | Markdown Markup Language Source Code | Apple TextEdit | Apple |
| .ME | Unknown Developer | Uncommon Files | Temporary Delete Me File | Apple Pages | Apple |
| .MEMORY | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MENU | id Software | Game Files | Quake 3 Engine Menu File | Apple TextEdit | Apple |
| .MERLIN | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
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