I use the Coinomi wallet

(best one out there-- available for Android and iOS, you control your keys and the wallet does not require KYC-- just like a hardware Ledger, Bitlox or Trezor does not-- and the wallet company, Coinomi, cannot freeze or lock out access to your coins like Freewallet and many other crypto "wallets" out there.  Remember, if someone can lock you out of your wallet then it is not your wallet. Enjin's cell phone wallet is a good candidate also.)

however to find your .dat file use Windows search function and make sure "hidden" and "system" files are included and search for

"wallet.dat"

and it should turn up.