Z7 extension is related to Zone Alarm eMail security file. You can open z7 with Zone Alarm software.
It is an internet protective software called Zone Alarm. It keeps the files protected with z7 extension. These files may come with an email. You are not able to open these files from the outside. If Zone Alarm puts in quarantine the files there may be an unfavorable situation ( such as virus or trojan). You can get detailed information from its official web page.
What to use z7
which page related to z7 file
z7 Related Searches
You can check related links about z7 fileextension.