Thanks for the help guys, however I managed to accumulate a steaming pile of crap; Execoin, Hirocoin, Megacoin, Heavycoin, Franko, Maxcoin, Riecoin, Bytecoin, Potcoin, Counterparty, Blackcoin, Vertcoin (OK I guess, but overall still equals a loss on initial investment). I remember being keen on privacy coins, therefore not sure how I missed Darkcoin (remember buying it, therefore must have sold or lost on an exchange failure like Mintpal 
) or Monero.
) or Monero. A bit off-topic, but Monero full node client is written from scratch so it's possible your Monero wallet file (if you bought Monero and store it locally in past) exist on other location.
I don't know about older version of Monero, but Monero wallet file don't have file extension.