How to unlock xlsb file

Sheetize XLSB Unlocker for .NET provides a straightforward API for opening an Excel binary workbook that is protected by a password. It restores full access to all worksheets, charts, and formatting, making it ideal for scenarios where a file must be read, edited, or processed after being secured.

Main Features

Unlock Password‑Protected XLSB

Decrypt an existing XLSB file using the user‑defined password. The unlock operation restores normal opening, editing, and printing capabilities.

Preserve Formatting & Objects

All cell styles, formulas, tables, charts, and images remain intact after the file is unlocked.

Streaming Support

Process large workbooks in a streaming fashion to keep memory usage low—perfect for batch‑unlocking many files.

Detailed Instructions

XLSB Unlock Workflow

To unlock a password‑protected XLSB file with Sheetize, follow these steps:

  1. Initialize the Unlocker: Create an instance of SpreadsheetUnlocker.
  2. Configure Options: Set UnlockerLoadOptions with the source file path and the password used to protect the workbook.
  3. Define Output Path: Provide the destination path where the unlocked XLSB will be saved.
  4. Execute Unlock: Call Process with the prepared load and save options.

Example – Unlock an XLSB file with a password

using Sheetize;
var loadOptions = new UnlockerLoadOptions
{
InputFile = \"Baby_growth_tracker.xlsb\",
Password = \"Test\"
};
var saveOptions = new SaveOptions
{
OutputFile = \"E:\\\\Unlocked\\Baby_growth_tracker.xlsb\"
};
SpreadsheetUnlocker.Process(loadOptions, saveOptions);

Example – Unlock an XLSB file that has a write‑protection password

using Sheetize;
var loadOptions = new UnlockerLoadOptions
{
InputFile = \"Baby_growth_tracker.xlsb\",
PasswordOfWriteProtection = \"Test\"
};
var saveOptions = new SaveOptions
{
OutputFile = \"E:\\\\Unlocked\\Baby_growth_tracker.xlsb\"
};
SpreadsheetUnlocker.Process(loadOptions, saveOptions);

Expanded Format Support

  • Sheetize can also unlock password‑protected CSV, TSV, and HTML exports (the files are wrapped in a ZIP with encryption).

With these capabilities, Sheetize makes XLSB unlocking effortless, whether you need a quick script to access a single workbook or a production‑grade service that processes thousands of protected spreadsheets daily.

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