Hello,

Exclusions for realtime shields are made on server-side i.e. Administration Console > NETWORK > Group Settings > Expert Settings > avast5://FileSystemShield/FileSystem/ScanException.
Examples:
C:\exampleapp.exe;\*;

The example excludes exampleapp.exe for Read, Write and Execute and also excludes all network drives.
The flags are:
-R - read flag
-W - write flag
-X - execute flag

Multiple entries are separated by semi-colons - ;

Regards