Scenario/Problem: You have a file without an extension, and the
Finder says it cannot open the file. How do you determine the
file type and its associated software?  Solution: Because you
have a file without any identifying information, you must use a
combination of social analysis and computer sleuthing to
determine the type of file and its associated application.
Social analysis should be done first, since it is easier and may
provide results more quickly.  What is Social Analysis?  With
social analysis, you want to determine the file type based on
the circumstances in which you came to receive the file. For
example, did a coworker email you the file because it relates to
a current project? Did you try to download a file for a specific
purpose (a disk image, an application, an MP3 file, etc.), but
you are only left with an unrecognizable file? Is the file’s
creation date relatively recent, or is it several years old?
Where is it located on your hard drive? In a system folder, your
Downloads folder, or some