Step by step :
- Download a HEX editor (HxD Hex Editor)
- Open xls/xlsx file and Save As xls. Do this even if the file is xls, just to be sure
- Open xls file with a hex editor
- Search for DPB
- Replace DPB to DPx (Note: the editor overrides, not inserts. So pay attention)
- Save file
- Open file in Excel
- Click "Yes" if you get any message box. There will be a few
- Click Alt + F11
- Click Tools -> [Project Name] Properties
- Click Protection
- Enter a new password twice
- Save
- Close and open the file again
- Type your new password to get to the required information.
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