TRZ is a file extension used by Norton Antivirus. It is a popular antivirus utility developed by Symantec. In addition to standard protection, it allows you to monitor e-mail or instant messaging and has a number of other tools.

TRZ are files used by the program to store data related to updating virus definitions and signatures. Updating the virus database has a significant impact on the security of the system protected by the program. Norton Antivirus has a mechanism for automatically updating such data.