File01 (3).avi -

Thirty seconds of the inside of a pocket or a floor, recorded because someone didn't realize the "REC" button was still on.

A shaky, low-resolution clip of a birthday party where everyone is wearing clothes that are now "vintage." File01 (3).avi

We’ve all been there—digging through an old external hard drive or a dusty USB stick when we stumble upon a file with a name that tells us absolutely nothing: . Thirty seconds of the inside of a pocket

Let us know in the comments, or better yet, go find that old drive and see what "File01" is waiting for you. The "File01" part usually suggests a default setting

The "File01" part usually suggests a default setting from an old digital camera or an early video capture card. The "(3)" tells us that at some point, there were at least two other versions, or this was the third clip in a series. The extension? That’s pure nostalgia—a container format that reigned supreme before MP4 took over the world. 2. What Could It Be?

A clip downloaded from a peer-to-peer network in 2005 that took three days to finish and was never actually watched. 3. The Risk of Opening the Past