The link for this week is a resource I use to find out information about files I don’t recognize (in email attachments or random system files on my computer). They have a fairly exhaustive list of file types that you can search for by the extension. It will tell you what the file is and what programs they are used for.

http://www.filext.com

As a side note, an extension for a file is the three or four letters at the end of a file’s name right after the last period.