B7 allows you to create a filter profile and apply it to files that come out of autopar.
1 - Generate a new filter profile. I called mine "UnRAR"
2 - Using ONLY the filename reject and accept windows, add filters.
Reject:
[.]txt$
[.]url$
[.]html$
[.]srr$
sample
...
3 - In the autopar options, both enable and select your new filter.
Now, when Newsbin does an unrar/repair and just before the files are sent to the files list, it applies this filter and will delete any matching files.