File extension ZONE.IDENTIFIER is a Windows zone identifier file. It contains metadata about security zones of downloaded files. Files get this extension automatically when downloading from Internet or as email attachment. Internet Explorer often creates them. These files also known as alternate data streams. They describe other files. The format is original filename colon Zone.Identifier. For example, download.exe:Zone.Identifier saved with download.exe. Windows uses them to manage security settings of downloads.
To open ZONE.IDENTIFIER file, install appropriate program supporting the format. Microsoft Windows supports these files. Go to Microsoft website to safely download. Install and update Windows to latest version. After installing, ZONE.IDENTIFIER files should open with Windows by default. Not all listed programs may perform all operations on these files. Some only open or view contents, others convert formats.
Right click ZONE.IDENTIFIER file and open with Choose another app. Select new program and check box to always use it. On Mac, right click file, Open with Other, select program, and check Always Open With box. On Linux, right click, Open with and select program. On iPhone, tap the file. This associates ZONE.IDENTIFIER with the program.
Microsoft Windows
Antivirus Software