Not that I even looked at them (read the .nfo occasionally) but they provided some visual padding between files in the 'Subject' column for downloaded files from the one group that I use. There are no filters set any where that I can find that would cause this NEW behaviour.
Upgraded from ?? to 6.52 and now only .nzb and .rar are listed and my old eyes find it very difficult to sort through the compressed file list.