Not sure about how to generate a SHA1SUM (but willing to try with guidance). For what it is worth, the file asOutExt.dll is digitally signed by Avast and reports size as 462,328 bytes, with size on disc as 462,848 bytes. As in your case, the time and date stamp is consistent with the other files in the directory. My memory - which is very fallible - is that there has always been an Avast add-in in my Outlook.
