Is there any easy way to create an empty file with the same name (but different extension) to an existing file?

I ask as my old video viewer used to make a sidecar file (actually with resume info in it) when I watched videos I'd shot, so it was easy to see which ones I'd looked at from possibly quite a bunch of new ones. The new viewer doesn't, but changing attributes is no use as my video editor won't show them, but it would show a sidecar file.