My old wallet.dat file has 9btc in it I forgot my password :D

[Maidak]

So my understanding is if i pretty much remember all of my possible password combinations except for the ones i would have auto generated in password safes that hashcat would be my option for cracking the password? hmm.. The thing is though i'm not sure which wallet exactly has all these coins either because this qt-wallet.dat was the one i used for my payment processing on mmoclub.com years ago and it just generated new wallet addresses for receiving everytime someone placed an order to identify them uniquely.

[nc50lc]

The thing is though i'm not sure which wallet exactly has all these coins either because this qt-wallet.dat was the one i used for my payment processing on mmoclub.com years ago and it just generated new wallet addresses for receiving everytime someone placed an order to identify them uniquely.

For that, you just have to load the wallet to Bitcoin Core and the correct balance should be displayed after it sync to the network
or if you already have a fully synced non-pruned Bitcoin Core, it only needs to be rescanned.

Even though it looked like it just generated an address whenever it needs a new one, it already has thousands pre-generated in the background which will be included to the scan.

Just for clarification, you said "qt-wallet.dat" in your post but in the title it's "wallet.dat", what's your wallet file exactly?
The former can be Bitcoin Core's wallet.

[LoyceV]

i'm not sure which wallet exactly has all these coins either because this qt-wallet.dat was the one i used for my payment processing

If you have multiple wallet.dat files, just load them into Bitcoin Core to see which one holds coins. Even without knowing the password it should show you the balance.
Syncing may take a while though.

[PawGo]

So my understanding is if i pretty much remember all of my possible password combinations except for the ones i would have auto generated in password safes that hashcat would be my option for cracking the password? hmm.. The thing is though i'm not sure which wallet exactly has all these coins either because this qt-wallet.dat was the one i used for my payment processing on mmoclub.com years ago and it just generated new wallet addresses for receiving everytime someone placed an order to identify them uniquely.

If you had one "wallet", then all the addresses should be there. I keeps all your addresses, why did you write "not sure which wallet exactly"?
Hashcat seems to be the best option if you need to find the password, but as you said - the chances are big only if it was somehow "personal" password. If it comes from password manager and/or is longer than 8-9 characters, the task becomes very very difficult.