'Copy ARCHIVE=.7z' Command report Error

Command report Error
Copy ARCHIVE=.7z,single,keepfolder HERE

This command runs correctly
Copy ARCHIVE=.zip,single,keepfolder HERE

single causes Opus to use a mode of adding files to each archive which is slower for zip and not supported by the plugin that handles everything else.

As a simple workaround (useful for both formats), you can use a command like this:

DOpusRT /acmd Copy {file} HERE ARCHIVE=.7z

The script here does something similar but more advanced, which might be useful if you want more complex logic: