If your file is an .xlsx (Excel 2007 and later), it is essentially a ZIP archive. You can remove the password without any software:
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: Choose "Recover Open Password" or "Remove Workbook/Worksheet Password". If your file is an
Open the XML file for your sheet and delete the tag starting with Save, re-zip, and change the extension back to Spiceworks Community Excel password recovery - Spiceworks Community Iseepassword Dr.excel License Key