Try to combine known personal information, birthdays, dictionary words, etc. See if you can guess the password.
Use various Excel password cracking tools to crack passwords through dictionaries and strong cracking.
Enter the wrong password for many times in the password prompt box of Excel, activate the backup recovery key, and use this key to unlock it.
By modifying the registry to delete the encryption mark, the file will be restored to the unencrypted state and opened directly.
Use the password viewer to view the Excel process memory and find the residual information of the password or encryption key.
Use GPU to accelerate the cracking function and violently crack complex passwords.
Retrieve the unencrypted Excel file of the old version history and get the data directly.
Copy the contents directly into the new Excel table and discard the original encrypted file.
Contact the file creator for a password hint or request to reset the file password.
If there is no other way, you can try to send it to a data recovery company for professional decryption.
It should be noted that multiple failed password attempts may trigger the file to be completely encrypted or damaged, so be careful.