Trend Micro Pattern File contains Virus Pattern Files with latest virus databases. The Official Pattern Release or OPR is Trend Micro's latest compilation of patterns for identified viruses.Trend Micro offers various types of Pattern Files to protect customers from Malware, Spyware/Grayware, and other threats. It is guaranteed to have passed a series of critical tests to ensure that customers get optimum protection from the latest virus threats.Use this version of the pattern file for all Trend Micro products running on Intel or DEC Alpha based operating systems and for products using virus scanning API Library.