Before playing, you can right-click the file and view "Properties" (Windows) or "Get Info" (Mac) to check for author information or original creation dates. Full text of "Opera" - Internet Archive
While "Erox In" can appear in various contexts, it has been linked to:
Records show the name "Erox" was acquired as a trademark for specific product lines in the early 2010s.
This indicates a standard MPEG-4 video format, which is the most widely supported format for streaming and local playback across devices. Potential Contexts