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I have a solution to unlock a password-protected Excel sheet, use eSoftTools Excel Password Unlocker Software.
The secure key feature of Excel Unlocker
  • Recover lost Excel, Word, & Access file password
  • Unlock locked Excel (.xlsx, .xls, .xlsm, .xlsb, .xla, .xlam, .xltm) file password
  • Remove password with the help of Mask attack, Dictionary attack, & Brute Force attack
  • Supports all MS Excel versions 97 up to 2019 and Windows 10 (32-bit, & 64-bit)
It has provided a FREE DEMO VERSION and show the first three character as a hint.