If you see other terms in similar filenames, they usually refer to:
: Supplemental material (like director commentary or deleted scenes). subtitle Halloween.Kills.2021.EXTENDED.SLOSubs....
: Subtitles that only appear when a foreign or alien language is spoken. If you see other terms in similar filenames,
: Indicates the subtitle is synced for the longer cut of Halloween Kills (2021), which includes extra scenes not found in the original theatrical version. subtitle Halloween.Kills.2021.EXTENDED.SLOSubs....