WinSCP cannot unzip local file by itself. You have to have external application installed for that. Then you may be able to call it from local file context menu within WinSCP.
How can I unzip a file in a server using WinSCP?
The path is /home/appladmin/APEX/apex_3.2.zip
When I double click the file, it opens winzip application and saves unzipped files in temporary directory which seems to be in my local drive.
When I tried to extract those files to a specific folder in the server I see only the folders in my local drive.
Would appreciate step by step instruction.