Files that contain the .vir file extension are infected computer files that have been renamed by an anti-virus application. This is done to keep the file from running on a user's computer and causing damage to the system or a corruption of data.
For example, when Norton AntiVirus finds a file on a computer that has been infected by a virus it will rename the file with the .vir file extension to notate that the file has been infected. This prevents the file from being executed on the user's system.
If you remove the .vir file extension from a file that has been modified as a VIR file by an anti-virus program, you may enable the virus to do harm to your computer.
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If you have additional information about the VIR file format or software that uses files with the VIR suffix, please do get in touch - we would love hearing from you.