How do I add an "unzip" custom command ?

Assuem I have a remote *.zip file (rathen than an *.tar.gz archive).

Now I want to unzip this remote archive in the current directory by using a WinScp context menu.

How do I do this ?

If I define a custom command

unzip "!"

then mark the remote zip archive and click "unzip" in the context menu then I got always a popup
"Host has not answered for more than 15 seconds. Still waiting"

Because other commands word fine and immediately this cannot be an error of the remote host but of WinSCP.

What else can I do ?

It works fine for me. Maybe it really takes a long time (if the zip file is large). Have you tried waiting?

There's a good chance it asks for confirmation to overwrite the same file if it already exists. You cannot run commands waiting for user input.