Nero Showtime files-- I didn't ask for these

Does Nero rewrite _ts files as Showtime files? This could
account for a disk space problem I am experiencing.

I'm getting contradictory file sise info at the burn
stage for DVD Shrink.

Nero will not go to burn the file originally created in
DVD Decrypter.... or I am not using the right command
sequence in Nero. Please advise of the correct 'Nero expressions"
to do this.