Copy EXTRACT tied to extentions

Recently I have discovered that Copy EXTRACT is unable to extract files from archive if the archive's name does not have an appropriate extention.

Is it a bug, or is it by design?

Directory Opus 10.0.2.1.4344 x64
Vista Ultimate x64

By design.

You can add to the list of zip extensions, but ones handled by the Archives plugin are currently hardcoded.