Nice try you colluding quizzler, but not good enough to elude the World's Greatest Detective!
>Riddle me this, Batman? What is less than 13, but more than 50?
One old man. His age is greater than fifty, but there is only one of him! But that's not the end to your fiendish puzzle. It's easy. Too easy!
Where else could the clues lie unless it involved... THE FILENAME!
>489916-frank_gorshin_riddler1.jpg
Old man... Frank Gorshin! The actor that portrayed you in the hit television show based off mine and the Boy Wonder's many adventures! But what could he have to do with anything? He passed away at the age of 72.
But knowing you, it's not the age of the actor, but the clue hidden in his age. Seventy-two. An abbreviation of 1972. Cross referencing this with the Batcomputer shows that Mr. Gorshin appeared only in "The ABC Comedy Hour" during that year.
>A-B-C
Curse your crooked mind-games! You're implying that this is a game that any child could solve. A boast befitting of you, Riddler.
>Comedy Hour
Who else knows comedy better than the cruel clown prince of crime, Joker? You plan on striking at a certain hour at a certain place in time...
--which leads up to the "489916" in your filename. Seemingly nonsensical, the numbers at first made no sense for every cipher we put it through. But maybe we had the wrong perspective this whole time... if we turn it upside down...
"h86619"
And if you phonetically sound it out:
"Hate Six Six One Nine"
The "Six One Nine" is a San Diego area code. The 6th area to have such a code is the Carmel Mountain Ranch, which is known for it's prestigious country club! You despise the fat cats enjoying the luxuries you yourself plan on stealing with the Joker!
Well good luck making the attempt, Riddler. Your dastardly deeds have been notified to Commissioner Gordan and his men are on their way to intercept and arrest you and your crazed cohort!