FileSystemWatcher Class - Excluding Directories

Determine if the file is a directory in your event handler, and do nothing then:

private void WatcherOnCreated(object sender, FileSystemEventArgs fileSystemEventArgs)
{
    if (File.GetAttributes(fileSystemEventArgs.FullPath).HasFlag(FileAttributes.Directory))
        return; //ignore directories, only process files

    //TODO: Your code handling files...
}

You probably haven't read http://msdn.microsoft.com/en-us/library/system.io.filesystemwatcher.filter.aspx. You cannot exclude anything with Filter property. It only includes objects matching filter.

If you want exclude something, do it in events fired by FSW.