I have been backing up iMovie 08 files to my external drive, but for some reason I can't open these files in iMovie.  I used drag and drop to copy them.

I have been backing up iMovie 08 files to my external drive, but for some reason I can't open these files in iMovie.  I used drag and drop to copy them.

You really should be doing backups with an actual backup application, especially one that will work automatically, and, if your external HD is large enough, back up your entire system.  These can automatically back up only what's changed since the  previous backup, and some will keep "archive" copies of things you've changed or deleted, also.
Too many things can go wrong, such as your internal HD failing, and you'll have a major project to reinstall everything.
You already have Time Machine, built-in to OSX.  You might want to review the Time Machine Tutorial, and perhaps browse Time Machine - Frequently Asked Questions.
#27 in the second link mentions some alternatives, too.

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