You can specify which file extensions are scanned during on-access scanning.
Scan all files
Click this to enable scanning of all files, regardless of the filename extension.
Allow me to control exactly what is scanned
Click this to restrict scanning to only files with a particular filename extension, specified in the extension list.
To add a filename extension to the list, click Add. You can use the wildcard ? to match any single character.
To remove a filename extension from the list, select the extension and click Remove.
To change a filename extension in the list, select the extension and click Edit.
When you select Allow me to control exactly what is scanned, Scan files with no extension is selected by default. To disable scanning of files with no filename extension, deselect Scan files with no extension.