A .ZAP File (Zero Administration Package) is a text file, which allows the publishing of an application to a user on a Microsoft Windows system (Windows 2000, XP Professional, Windows Vista, or Windows 7 Professional), for applications for which a .MSI file does not exist. It is used in Active Directory Domains and is installed using a Group Policy. A .ZAP File (Zero Administration Package) is a text file, which allows the publishing of an application to a user on a Microsoft Windows system (Windows 2000, XP Professional, Windows Vista, or Windows 7 Professional), for applications for which a .MSI file does not exist. It is used in Active Directory Domains and is installed using a Group Policy.