ZLD

ZoneAlarm Mailsafe renamed INS file
File type: Various data file
A zld file extension is related to the ZoneAlarm Pro, a personal firewall. A zld file stores renamed INS files.
What is zld file?
File type category:
Various data file
Date updated: January 12, 2018
The zld file extension is associated with ZoneAlarm, a personal firewall software, originally created by Zone Labs and currently developed by CheckPoint Software Technologies LTD.
One of ZoneAlarm features is MailSafe, which detects e-mail attachments and warns the user about their presence. When a potentially dangerous attachment is detected, the program quarantines the file with simple renaming of its original file extension, so it breaks the common program association function in Windows and prevents such files from being executed (or launched via associated program).
A file with zld file extension originally had INS file extension (InstallShield script file). Simple renaming will restore the Windows associations with such file, however it is not advised, unless you are absolutely sure it safe to do.
How to open zld file?
You can rename the ZLD file extension back to INS and work with the file normally. This can however be potentially dangerous, because the file was quarantined for a reason. So always re-check it with your anti-virus or anti-spyware programs before you rename the files.
Suggested software to open zld file:
Associated software actions with the zld file
Software apps that create zld files:
ZoneAlarm Pro (Microsoft Windows)
Software applications that handle other tasks involving zld files:
ZoneAlarm Pro (Microsoft Windows)