The system automatically identifies the specific encryption method used by your file based on the Excel version (e.g., Excel 97-2003 old encryption versus modern AES-128 or AES-256 bit encryption used in Excel 2010–2026). It then optimizes the recovery workflow accordingly. How the Recovery Process Works
Drag and drop your locked Excel file or select it from your device 1.2.2.
Once the process is complete, LostMyPass will display the recovered password. Use this to access your Excel file.
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These files use a very weak hashing algorithm. LostMyPass can typically break these passwords using a known-plaintext attack.
A: Yes, it recovers both "password to open" and "password to modify" in the new version.
The system checks the file against a massive database of commonly used passwords (dictionary attack). If the password is weak or standard, it cracks it very quickly. Once the process is complete, LostMyPass will display
Consider using a password manager to securely store your passwords.
If your Excel file is saved in OneDrive and you unlocked it with your Microsoft Account, try the flow on login.live.com. This does not help with local passwords.
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Wait for the automated phase to sweep its database.
Fortunately, password retrieval technology evolves rapidly. The updates introduce enhanced cloud-computed decryption tools designed to unlock modern Excel files (.xlsx) and legacy formats (.xls) faster than ever before.