: This is the "tag" of the release group, likely Extreme Entertainment (often abbreviated as XTM in the digital scene).
Before standardized database scrapers like Plex or TVDb existed, tracking television episodes relied heavily on air dates. The string 111017 follows the YYMMDD format, indicating the episode originally aired on October 17, 2011. This precise dating helped automated scripts organize files chronologically. 4. The Source Material: HDTV -XTM- 2 .E01.111017.HDTV.XviD-WS.avi
Why keep a file with such a "messy" name? : This is the "tag" of the release