File Types

Discussion in 'Mac Basics and Help' started by iMatt mini, Aug 19, 2005.

  1. iMatt mini macrumors 6502

    Joined:
    Mar 1, 2005
    Location:
    Central New Jersey
    #1
    Coming from a Windows life, what file types are different?
    It looks like DMG=EXE but I'm not even sure on that.
    I've never used Mac's to the extent of looking at file types, just basic web browsing and iTunes and Photoshop.
     
  2. robbieduncan Moderator emeritus

    robbieduncan

    Joined:
    Jul 24, 2002
    Location:
    London
    #2
    A DMG is a disk image. It's like a filesystem contained in a single file. It is not executable (it's a bit like a .iso).
     
  3. yellow Moderator emeritus

    yellow

    Joined:
    Oct 21, 2003
    Location:
    Portland, OR
    #3
    I think most file extensions are about the same, assuming the applications that create them exist on both computers. There are a few that don't exists on Windows, .dmg being one of them. I suspect .pkg and .mpkg don't exist (or aren't the same) on Winodws. It's a package file that contains OS X installers (and the associated peices/parts).

    But really, this is just too expansive a question to answer. :)
     
  4. Doctor Q Administrator

    Doctor Q

    Staff Member

    Joined:
    Sep 19, 2002
    Location:
    Los Angeles
    #4
    The equivalent of a Windows .exe file is called .app (for "application") under Mac OS X, although file extensions aren't always displayed. An .app file is actually a packaged collection of files, containing the run-time code and various resource files, but you don't have to be aware of that since Mac OS X makes it look like a single application file unless you specifically ask to see the contents.

    Years ago, Mac files included within them a "creator" tag that identified what application they belonged to, so Mac OS knew what program to launch from the file's content, not the filename. But Mac OS X now relies by default on knowing what application to launch based on a file's extension, as Windows does.

    Extensions such as .txt (text), .pdf (Acrobat file), and .doc and .xls (MS Office) are the same as Windows. Extensions for the main types of executable files are different. In addition to .app for executable applications, for example, there are executable .scpt files (one of the ways to store AppleScript files), and executable .command files (Unix-style shell scripts). There is also .workflow, an executable script created with the Mac OS X "Automator" application. Some executables, such as perl programs, can use the same extensions as under other operating systems.
     
  5. yellow Moderator emeritus

    yellow

    Joined:
    Oct 21, 2003
    Location:
    Portland, OR

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