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Okay, that suffix doesn't mean the file is crippled. What does it mean?

Now that I know the difference between embedding files and attaching them, I'm careful to hold down the control key when I want attachment.

When I do that, I always get an icon with the little "alias" arrow in the bottom left corner. But sometimes the label has ".oo3" after the name, and sometimes not, even when they both have the alias arrow.

What's happening?