All versions of Office 2007 and above use AES encryption. There is no other way to decrypt the file; you can only guess the password by trying it. The number of passwords is astronomical, and it's impossible to try them all. For example, an 8-digit length of lowercase letters and numbers would amount to as many as 2800 billion passwords. Under normal circumstances, many passwords are longer than 8 characters. It's impossible to violently run all the passwords.
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