How to Filter With Avast http://www.ehow.com/how_7562490_filter-avast.html
Thank you for your help!
I'm afraid that is an old ehow article as the new versions of avast5 & 6 don't drill down to file level only to folder level.
Note: When using the Browse button it only goes down to folder level accept that. Now open the entry in the exclusions and change the \* to \file_name.exe where file_name.exe is the file you want to exclude.
The warning is also totally lacking, excluding a folder can leave a hole in security, where ever possible you should exclude files not folders. If excluding folders then you should limit the exclude to file types within a folder, e.g. c:\folder-name\*.mp3 so should an executable end up in that media folder it isn't excluded.