just out of curiosity xlsx (and docx files etc for that matter) are just Zip containers for the xml files etc (rename any file to a zip extension and load in winrar or similar) and you can see all the files, just a matter how and what is therefore passworded with relation to getting the data
Or you can use a faster online recovery service like password-online.com.
They are super fast. Decryptum and others don't offer to decrypt docx or xlsx passwords only the old format.
Bookmarks