Office 2007 and above versions all use AES encryption, and there is no other way to unlock files. You can only guess the password by trying it with a password. The number of passwords is an astronomical number, and it is not possible to try all of them. For example, an 8-digit lowercase letter and number can reach a password of 28000 billion. Under normal circumstances, many passwords used exceed 8 digits in length. It is impossible to run all the passwords with violence.
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