I'm not aware of any wallet software which let you import 10000 "12 backup/seed word" or "wallet file" into single wallet file. On this scale, it's more practical to write script which automate tasks you want to do. But take note most block explorer won't let you check balance/transaction of thousand address in short time. You either have to use list of funded address or run your own block explorer to check whether generated address contain Bitcoin or not.
hello i have 10000 crypto wallet all of them have defrent 12 backup words how i open all of them in same time from program or something to insert txt file and it open .. its hard to keep open one eveytime
Depends what do you want to do. I assume that if you want only check the balance is would be simpler to convert seeds into addresses (depending how many addresses you want to generate and for which derivation path) and import them into single watch-only wallet.
Some SPV wallet (such as Electrum) perform poorly when the wallet contain thousand address, either because the server has rate limiting or simply not scalable. But IIRC Bitcoin Core can handle wallet with million address.