I was wondering something, if I put the .EXE of an applications that I wish to trust, does it trust all files open with this app? Example; trusting WINWORD.EXE (Microsoft Word) really accelerate the time for saving files. So I trust this application in the Trusted Apps. Will this exclude .DOC and .DOCX opened with this application from being scanned ?
No it wouldn't. Keep in mind that this is trusted "Apps". Doc and Docx aren't apps. Therefore you would want your AV to scan any documents opened with the app, even though you may trust the app. The primary purpose behind the trusted apps is to prevent KAV from scanning the app as it opens, which in some instances causes issues with the app. Especially in situations where an app needs to communicate with external devices.