The indexof trick is dead. The "better" way is to put on your detective hat, search your own basement for old hard drives, and use proper crypto-forensic tools.
Never test or run unknown wallet files on your primary machine or any computer connected to the internet. indexofbitcoinwalletdat+better
Have a locked wallet.dat from 2013 that you legitimately own? Contact a reputable data recovery specialist—not a random Telegram group. The indexof trick is dead
The term "indexofbitcoinwalletdat" often refers to scenarios where, due to misconfigured web servers or exposed backups, a wallet.dat file becomes discoverable via a directory listing (often found with index of / in web browsers). indexofbitcoinwalletdat+better