As you know, you need to use the Exclusion lists:
For the
Standard Shield provider (on-access scanning):
Left click the 'a' blue icon, click on the provider icon at left and then Customize.
Go to Advanced tab and click on Add button...
For the other providers (
on-demand scanning such as the screen-saver or the Simple User Interface):
Right click the 'a' blue icon, click Program Settings.
Go to Exclusions tab and click on Add button...
You can use wildcards like * and ?.
But be careful, you should 'exclude' that many files that let your system in danger.
But better, can you inform the file as being a false positive? (click on the bottom right of the virus warning message).
To know if a file is a false positive, please submit it to
VirusTotal and let us know the result. VirusTotal has a file size limit of 10Mb. You can use
VirScan also.
If it is indeed a false positive, send it in a password protected zip to virus@avast.com. Please, mention in the body of the message why you think it is a false positive and the password used. Thanks.
Maybe you need to disable
Hide protected operating system files and enable
View hidden files and folders to manage the file(s).