If you cannot access an official commercial tool immediately, you can attempt manual recovery methods for newer Excel formats (.xlsm) using standard zip extraction tools. This method works because modern Office files are actually zipped XML archives. Manual VBA Unlocking Method (For .xlsm files)
You can also run a VBA script within the Office application itself to attempt to recover the password. For Word, for example, you open the VBA editor (Alt + F11), insert a module, paste a specific VBA script, and run it. The script will attempt to brute‑force or recover the password. systools vba password remover activation code work portable
SysTools VBA Password Remover - Descargar e instalar en Windows If you cannot access an official commercial tool