This is a very minor issue. And its more issue of Windows then 7-zip.
In Windows 7 Ultimate when I in double panel mode open folder in archive from one side and folder in c:\Program Files\Far\Plugins in the other side there're the following issues related to windows.
1. Created folder 7-zip is visible to 7zfm only;
2. Copying of .reg files fails.
3. After closing 7-zip and opening this folder in explorer nothing is changed.
if to create everything in explorer it requests confirmation dialogs and everything goes fine.
FAR also supports this. It shows own dialog and then system dialog before altering data.