How can I find out which wallet belongs to which cryptocoin? I have multiple decrypted wallets in the same folder. How can I find out which wallet belongs to which cryptocoin? All wallets are named wallet_x.dat, so the name gives no hint.

UPDATE:
I have no access to the addresses within the wallet, because I can't import them, because I don't know which client I would need.
Take a look at the wallet address, if it starts with 1 it is a Bitcoin wallet, if it starts with an L it is a litecoin wallet and so on, google to know how to identify the starting of the rest of the crypto wallets (blockchains are the first places to go).