I found three files on Windows called "wallet.dat" and copied/renamed them onto my desktop. They'd already been listed as having been modified today, and the address where my AC were instructed to be sent to from Poloniex on April 30th already matches the address under the "receive coins" tab in my wallet. So I doubt this will work...but where should I swap in one of these other wallet.dat files?
renaming them is/ was a bad idea. wallet.dat is the file that holds your coin data.
you can try to import the most recent one or import it... i'm not sure what exactly you did or how many other coins you have...
it would have been in the asiacoin folder inside of roaming originally :/