Exclusions
Here you can enter or modify any locations that should not be scanned by the file system shield. Note however, that exclusions specified here will only apply to the File System Shield and not to any other scans.
Certain files are excluded by default at the moment of reading and writing. You can also specify other file types that should be excluded at the moment of reading (R), writing (W), or executing (X), by clicking on “enter path” and either typing the path to be excluded, or clicking the browse button to select it.
To exclude files from being scanned by any part of avast!, including manual and scheduled scans, it is necessary to specify the files or areas to be excluded in the general program settings.