To remove the password to open the Excel file, I recommend
eSoftTools Excel Password Recovery software. It is a great tool to remove password from Excel files. It provides three methods: Brute Force Attack, Mask Attack, and Dictionary Attack. All these methods are completely safe as none of them damage the data. This allows you to remove the password in 3 to 4 steps. If for some reason the password is not recovered, your money will be refunded within 30 days, and any user can download this software from the link given below.
INFO;-
Remove encryption from Excel