This article is by Moksha:
Ever wanted to have a copy of that hilarious video you found on Google Video? I know they let you download a file to watch with Google Player, but that’s still streaming it, and you can’t use that file for anything else. Read on.
With a bit of poking around, I discovered how you can get a link to download a .avi file of the movie you want.
For my example, I’m going to use Intermission in the Third Dimension by Donald Hertzfeld, because it’s really funny.
Step 1: Go to the regular Google Video site for your movie, in this case here.
Step 2: Click the Download for Windows/Mac button. It’ll start downloading Google Video Player, just stop that download, and then click on “Manually download the video”. 
Step 3: A small (around 4 KB) file, in this case called IntermissionintheTHI.gvp will download, which is supposed to be something you open with Google Video Player, but we know better than that.
Step 4: Right- or Control-Click this file, choose Open with, and select other.
Step 5: It’ll give you a list of applications you can open the file with, go down and select TextEdit.
Alternatively, if you think you’re going to do this a lot, Get Info on the .gvp file, go to Open With, choose Other, and select TextEdit. Now click the Change All button, which will make TextEdit the default application to open up the .gvp files with, saving you those tedious steps.
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