091711-809-carib-whole.wmv

First part is 091711. That's likely a date. If we split it into 09, 17, 11, it could be month 9 (September), day 17, year 11 (which would be 2011 in the 2000s, or 1911? Wait, but the next part is 809. Maybe year first? Hmm. Sometimes dates are in mmddyy format, but there's also ddMMyy. Let me check possible date interpretations.

Then the next number is -809. That could be a sequence number or an identifier. Maybe it's the part of a series or a specific identifier for this particular file or version. 091711-809-carib-whole.wmv

If 09 is the month (September), 17 is the day, 11 is the year, that would be September 17, 2011. That seems plausible. So the first part is the date 09/17/11. First part is 091711