To get snapshot of DOGX it’s recommended to keep DogeCoins in any wallet that supports export of your private key (like Dogecoin Core). We can’t guarantee that exchanges give you your DOGX automatically.
DOGX will be released after fork of DogeCoin’s blockchain. When it’s done, you will be able to import your key (stored in Wallet.dat) in official DOGX Wallet and spend your new fast and smart tokens.
When fork is done, before export and manipulations with Wallet.dat, it’s recommended to move all DogeCoins to another wallet, so no one can steal your private key with DogeCoins. After key is imported in password protected file, remove any files which contain private key in plain text.
Import Wallet.dat only in official DOGX wallet, or you may lose all forked DOGX.
List of official soft is available on https://dogethereum.net