I'm completely new to Xcode. The MacOS executable for Xcode Previews is normally 174K. Using Time Machine I find it has always been so. Avast removes that executable to it's "Virus Chest". I restore it from Time Machine to a temp directory and re-run Avast finds it again. I'm not actually *using* Xcode Previews as far as I know, my simple apps (not SwiftUI etc) still compile and run.