All versions of Office2007 and above use AES encryption. There is no other way to unlock files. You can only guess the password by trying a password. The number of passwords is astronomical and it is impossible to try all of them. For example, an 8-digit lowercase letter + number can reach 2.8 trillion passwords. Under normal circumstances, many passwords used exceed 8 digits long. It is impossible to run through all passwords violently.
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