Warning: recovering cryptocurrency from an old wallet.dat involves handling sensitive private keys. Proceed only on a secure, offline machine if possible and never share your wallet.dat or private keys.
To underscore the urgency, consider the cautionary tales. old walletdat hot
wallet.dat from 2012. It contained 1,400 BTC. He had encrypted the file with a password he forgot. He tried 100 guesses. The file is now effectively destroyed. His "hot" wallet became a cold corpse.wallet.dat with 200 BTC. The buyer kept it. The sale is now the most expensive mistake in Craigslist history.wallet.dat passwords. He targeted old files uploaded to Pastebin by accident. In one week, he drained 50 wallets totaling $4 million. His method? Searching for "old wallet.dat hot" on forums.After securing the BTC, use a service like Coinomi or Electrum (for altcoins) to claim your Bitcoin Cash (BCH), Bitcoin Gold (BTG), and other forks. An old wallet from 2013 is eligible for at least 5 different forks. That "old wallet.dat hot" might actually be 5x hotter than you thought. Complete guide: recovering funds from an old wallet
If you have an old wallet.dat and you suspect it is hot, follow this cold, offline, paranoid procedure. Do not deviate. The Password Wall: A man found his wallet