> Hiding filename extensions was one of the capital sins in computer history
Amen. The first thing I do on any (Windows) OS installation is make sure file extensions are shown. I guess Microsoft did that for "simplicity", but it also made for easy "virus.jpg.vbs" files.
A puppy.jpg.vbs file would be shown as "puppy" with "VBScript" in the type column. The full name may be worse though. "puppy.gpj.vbs" (which is actually "puppy\u202Egpj.vbs\u202C") looks like an image extension, but is a script (as the type column also shows).
Edit: Looks like HN removes those directional override characters. When present, the text looks like "puppy.sbv.jpg"