To How to retrieve 7z file password from an excel spreadsheet? use eSoftTools Excel Password Recovery Software. It supports the following extensions: xls,.xlsx,.xlsm,.xlsb,.xla,.xlam, and.xltm, and can remove passwords from Excel sheets. It includes incredible methods for recovering a file password, including Brute Force, Mask Attack, and Dictionary Attack. Functions with all MS Excel Versions and Windows OS also supported.