Figure 4: Let Emailer do it -- Here's a great reason why Mac users keep their sanity. E-mail
clients such as Claris Emailer understand how to correctly encode file attachments, and rarely
have to be told anything more about it. If need be, a user can set up their Internet account to
have the method of choice as a default for encoding. The best choice is usually Binhex.
To help out in this endeavor, I have enlisted the expertise of the e-mail experts over at America
Online. They see more of this kind of thing than anyone else -- on both the Mac and PC side -- and
have created documents which help clarify the issue. Here is the one called File Formats and can
be found by going to the E-mail Help area while online.
There are many files available online. This section explains how file extensions can tell you what
kind of file you are looking at. File extensions are three letters or numbers that appear at the end
of a file name and indicate what type of file it is. File extensions tell you whether the file is ASCII
(text only) or a graphic image, sound file, or program. Extensions can also tell you the platform
(Mac, Windows, UNIX, etc.) that was used to create the file. Extensions are used more often for
Windows files, but you will also see certain extensions used for Macintosh files.
Common File Types and Extensions:
Below is a list of common file extensions and information on the type of file (graphics, programs,
sounds) they signify.
Indicates a file compressed using the program ARC
(archive) for Windows.
Indicates a sound file from the Internet. Use either
AOL or SoundApp to play them.
Indicates a graphics file compressed using AOL's
Johnson-Grace system. These files can be viewed using
AOL software but can't be opened with most other
Indicates an audio visual file, used for Windows video
files. Apple's new QuickTime 3 can now play these.
Indicates a bitmap graphic -- very similar to PICT --
found in the Windows world.
Indicates a Dynamic Link Library. These files allow
different programs to work together. They are for
Windows machines only.
Indicates an Encapsulated Postscript File. These are
images designed for vector, or line-based, graphics.
Drawing programs such as Adobe Illustrator use this
Indicates an executable file; that is, a program. These
files are usually DOS or Windows applications. Unless
they are a self-extracting Zip archive, you can't open
them using any Mac application including MacLink
Plus. You must have a Windows emulator or
hardware card to see them.