A zlk file extension is related to the ZoneAlarm Mailsafe that detects e-mail attachments and warns the user about their presence.

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Software that open zlk file

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ZLK file extension - ZoneAlarm Mailsafe renamed MSI data

What is zlk file? How to open zlk files?

File type specification:

Various data file type icon Various data file type

zlk file icon: zlk filetype icon

The zlk 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 zlk file extension originally had msi file extension (Microsoft installation package 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.

The default software associated to open zlk file:

ZoneAlarm Pro icon

Check Point Software Technologies Ltd. logoZoneAlarm Pro  Microsoft Windows software

Company or developer:
Check Point Software Technologies Ltd.

ZoneAlarm Pro is a set of tools used to protect computer against hacker attacks,destroy spyware, and secure privacy.

Related articles:

Mailsafe renamed file extensions

Help how to open:

You can rename the zlk file extension back to msi 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.

How to convert:

Probably cannot be converted to anything else.

List of recommended software applications associated to the .zlk file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open zlk file, edit zlk file, convert zlk file, view zlk file, play zlk file etc. (if exist software for corresponding action in File-Extensions.org's database).

Unspecified and all other actions for computer programs working with zlk file - ZoneAlarm Mailsafe renamed MSI data

Click on the software link for more information about ZoneAlarm Pro. ZoneAlarm Pro uses zlk file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).

Microsoft Windows:

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