: Likely the name of the release group or source that distributed the file.
The filename appears to follow a naming convention commonly used for older digital media files, specifically those encoded in the RealMedia Variable Bitrate (RMVB) format which was popular in the late 2000s. Newstar-20080706-HL.rmvb
: A timestamp indicating the release or recording date of July 6, 2008. : Likely the name of the release group