To reduce the load on the SharePoint server caused by on-access Anti-Virus scanning, you can specify file formats or file name masks to be excluded from scanning and set the maximum size of files to scan.
To exclude unwanted file formats from on-access anti-virus scanning:
Select and open in the Management Console tree the node corresponding to the necessary SharePoint server. Then select the On-access scan node.
In the workspace, select the Exclusions from scan tab.
In the File formats list, select the check boxes next to the items in the file formats tree that correspond to the relevant formats.
Make a convenient use of the tree with the Expand all and Minimize all buttons.
To save the changes, click the Save button.
To exclude files that match specific masks from Anti-Virus scanning:
Select and open in the Management Console tree the node corresponding to the necessary SharePoint server. Then select the On-access scan node.
In the workspace, select the Exclusions from scan tab.
In the File masks list, select the check boxes next to file name masks to be excluded from the scan scope.
To add a mask to the list, open the Adding file mask window by clicking the Add button, and specify the mask in the entry field. To save the mask and close the window, click OK. The mask will be displayed in the File masks field.
If you want to define several masks, use a semicolon as a delimiter.