How to Open an Excel File in C# Without Microsoft Office
IronXL lets you open and read Excel files in C# without Microsoft Office installed -- just install the NuGet package, load a workbook with WorkBook.Load("file.xlsx"), and access any worksheet, cell, or range with typed values and automatic format detection.
If you have ever tried opening Excel files programmatically without Microsoft Office, you know how tricky the traditional Interop approach can be. Interop relies on Excel itself being installed, requires complex COM references, and often causes version conflicts -- especially on servers or cloud environments where Office is unavailable.
IronXL is a modern .NET library that lets you read XLSX, XLS, CSV, and TSV files directly, with no Office dependency required. You can write clean, reliable C# code, process Excel files on Windows, Linux, or in the cloud, and skip all the friction of COM automation. This guide walks through everything from installation to production-ready patterns for opening and reading Excel workbooks.
How Do You Install IronXL in a .NET Project?
Getting started takes only a few seconds. Open your project and use one of the following package managers:
Install-Package IronXL
dotnet add package IronXLInstall-Package IronXL
dotnet add package IronXLAlternatively, open Visual Studio, right-click your project, select "Manage NuGet Packages," search for "IronXL," and click Install. The installation guide covers all supported environments including Docker and Azure.
Once installed, add the namespace at the top of your file:
using IronXL;using IronXL;Imports IronXLThat single line is all you need. There are no complex COM references, no Office dependencies, and no version-specific assemblies. For a free evaluation key, visit the IronXL trial license page.
Why Is IronXL Easier Than Traditional Interop?
Traditional Excel Interop requires Microsoft Office on every machine that runs your code. That is impractical for server deployments, AWS Lambda functions, and containerized applications. IronXL handles all Excel file parsing internally, providing a clean API that works without any external dependencies.
With Interop, you also need to manage COM object lifetimes carefully to prevent memory leaks -- every Application, Workbook, and Worksheet object must be explicitly released, otherwise Excel processes accumulate in the background. IronXL uses standard .NET garbage collection, so you never need to think about COM cleanup.
The library supports .NET Framework 4.6.2 and above, as well as .NET 5, 6, 7, 8, and 10. It runs on Windows, macOS, and Linux without modification. If you are targeting cross-platform scenarios, this alone makes IronXL a substantially better fit than Office Interop, which is Windows-only.
How Do You Verify the Installation Worked?
After installation, create a simple test by loading any Excel file and printing a cell value. If the project builds without errors and the output matches expected data, the setup is complete. The IronXL documentation includes a quick-start section that walks through this verification step in detail.
A common mistake during setup is forgetting to apply a license key before loading a workbook in production. In trial mode the library adds a small watermark to any generated files. Set IronXL.License.LicenseKey at application startup so all operations run under the correct license from the beginning.
How Do You Open an Excel Workbook and Read Cell Values?
The core API is straightforward. Load a workbook, select a worksheet, and access cells by address or by iteration.
using IronXL;
// Load any Excel file -- XLSX, XLS, CSV, or TSV
WorkBook workbook = WorkBook.Load("example.xlsx");
// Access the second worksheet (zero-indexed)
WorkSheet worksheet = workbook.WorkSheets[1];
// Read a specific cell value
decimal revenue = worksheet["E2"].DecimalValue;
Console.WriteLine($"Order Total: {revenue}");
// Iterate over a range of cells
foreach (var cell in worksheet["C2:C6"])
{
Console.WriteLine($"Product: {cell.Text}");
}using IronXL;
// Load any Excel file -- XLSX, XLS, CSV, or TSV
WorkBook workbook = WorkBook.Load("example.xlsx");
// Access the second worksheet (zero-indexed)
WorkSheet worksheet = workbook.WorkSheets[1];
// Read a specific cell value
decimal revenue = worksheet["E2"].DecimalValue;
Console.WriteLine($"Order Total: {revenue}");
// Iterate over a range of cells
foreach (var cell in worksheet["C2:C6"])
{
Console.WriteLine($"Product: {cell.Text}");
}Imports IronXL
' Load any Excel file -- XLSX, XLS, CSV, or TSV
Dim workbook As WorkBook = WorkBook.Load("example.xlsx")
' Access the second worksheet (zero-indexed)
Dim worksheet As WorkSheet = workbook.WorkSheets(1)
' Read a specific cell value
Dim revenue As Decimal = worksheet("E2").DecimalValue
Console.WriteLine($"Order Total: {revenue}")
' Iterate over a range of cells
For Each cell In worksheet("C2:C6")
Console.WriteLine($"Product: {cell.Text}")
NextWorkBook.Load() automatically detects the file format -- no need to specify whether the file is XLS or XLSX. Access worksheets by index or by name using workbook.GetWorkSheet("Sheet1"). Each cell exposes typed properties such as IntValue, DecimalValue, DateTimeValue, and Text.
For more options on opening files, see the open workbook how-to guide.
How Do You Access Worksheets by Name?
Using worksheet names is more maintainable than numeric indexes, especially when workbooks are edited by others. The following example shows how to look up a sheet by name and iterate through all sheets:
using IronXL;
WorkBook workbook = WorkBook.Load("inventory.xlsx");
// Access worksheet by exact name
WorkSheet salesSheet = workbook.GetWorkSheet("Sales Data");
Console.WriteLine($"Sales sheet rows: {salesSheet.RowCount}");
// Iterate all worksheets in the workbook
foreach (WorkSheet sheet in workbook.WorkSheets)
{
if (sheet.Name.Contains("Inventory"))
{
Console.WriteLine($"Found inventory sheet: {sheet.Name}");
}
}using IronXL;
WorkBook workbook = WorkBook.Load("inventory.xlsx");
// Access worksheet by exact name
WorkSheet salesSheet = workbook.GetWorkSheet("Sales Data");
Console.WriteLine($"Sales sheet rows: {salesSheet.RowCount}");
// Iterate all worksheets in the workbook
foreach (WorkSheet sheet in workbook.WorkSheets)
{
if (sheet.Name.Contains("Inventory"))
{
Console.WriteLine($"Found inventory sheet: {sheet.Name}");
}
}Imports IronXL
Dim workbook As WorkBook = WorkBook.Load("inventory.xlsx")
' Access worksheet by exact name
Dim salesSheet As WorkSheet = workbook.GetWorkSheet("Sales Data")
Console.WriteLine($"Sales sheet rows: {salesSheet.RowCount}")
' Iterate all worksheets in the workbook
For Each sheet As WorkSheet In workbook.WorkSheets
If sheet.Name.Contains("Inventory") Then
Console.WriteLine($"Found inventory sheet: {sheet.Name}")
End If
NextThe read Excel file guide explains additional worksheet access patterns, including working with workbooks that have dynamically generated sheet names.
How Do You Read Different Data Types From Excel Cells?
IronXL exposes typed accessors for every common Excel data type. You can read strings, integers, decimals, dates, booleans, and formula results without any manual parsing.
using IronXL;
WorkBook wb = WorkBook.Load(@"C:\Data\Inventory.xlsx");
WorkSheet ws = wb.GetWorkSheet("Products");
// Read different data types directly
string productName = ws["A2"].StringValue;
int quantity = ws["B2"].IntValue;
decimal price = ws["C2"].DecimalValue;
DateTime updated = ws["D2"].DateTimeValue;
// Use aggregate functions on ranges for performance
decimal totalStock = ws["B2:B100"].Sum();
decimal maxPrice = ws["C2:C100"].Max();
Console.WriteLine($"Product: {productName}, Qty: {quantity}, Price: {price:C}");
Console.WriteLine($"Total stock units: {totalStock}, Highest price: {maxPrice:C}");using IronXL;
WorkBook wb = WorkBook.Load(@"C:\Data\Inventory.xlsx");
WorkSheet ws = wb.GetWorkSheet("Products");
// Read different data types directly
string productName = ws["A2"].StringValue;
int quantity = ws["B2"].IntValue;
decimal price = ws["C2"].DecimalValue;
DateTime updated = ws["D2"].DateTimeValue;
// Use aggregate functions on ranges for performance
decimal totalStock = ws["B2:B100"].Sum();
decimal maxPrice = ws["C2:C100"].Max();
Console.WriteLine($"Product: {productName}, Qty: {quantity}, Price: {price:C}");
Console.WriteLine($"Total stock units: {totalStock}, Highest price: {maxPrice:C}");Imports IronXL
Dim wb As WorkBook = WorkBook.Load("C:\Data\Inventory.xlsx")
Dim ws As WorkSheet = wb.GetWorkSheet("Products")
' Read different data types directly
Dim productName As String = ws("A2").StringValue
Dim quantity As Integer = ws("B2").IntValue
Dim price As Decimal = ws("C2").DecimalValue
Dim updated As DateTime = ws("D2").DateTimeValue
' Use aggregate functions on ranges for performance
Dim totalStock As Decimal = ws("B2:B100").Sum()
Dim maxPrice As Decimal = ws("C2:C100").Max()
Console.WriteLine($"Product: {productName}, Qty: {quantity}, Price: {price:C}")
Console.WriteLine($"Total stock units: {totalStock}, Highest price: {maxPrice:C}")The table below summarizes the available typed accessors:
| Accessor | Return Type | Notes |
|---|---|---|
StringValue |
string | Always returns a string, even for numeric cells |
IntValue |
int | Truncates decimal values |
DecimalValue |
decimal | Best for financial data |
DoubleValue |
double | For scientific or floating-point values |
DateTimeValue |
DateTime | Parses Excel serial date numbers automatically |
BoolValue |
bool | Reads TRUE/FALSE cells |
Formula |
string | Returns the formula text, e.g. =SUM(A2:D2) |
For full details on reading and writing cell data, see the cell formatting guide and the import data how-to.
How Do You Handle Empty or Null Cells Safely?
Empty cells are common in real-world Excel files. Use the IsEmpty property or check Value for null before reading typed accessors:
using IronXL;
WorkBook workbook = WorkBook.Load("data.xlsx");
WorkSheet ws = workbook.DefaultWorkSheet;
// Check if a cell is empty before reading
if (!ws["A1"].IsEmpty)
{
Console.WriteLine(ws["A1"].StringValue);
}
// Provide a fallback value using a null-coalescing pattern
string cellText = ws["A1"].StringValue ?? "Default Value";
// Iterate a range and skip empty cells
foreach (var cell in ws["A1:A20"])
{
if (!cell.IsEmpty)
{
Console.WriteLine(cell.Text);
}
}using IronXL;
WorkBook workbook = WorkBook.Load("data.xlsx");
WorkSheet ws = workbook.DefaultWorkSheet;
// Check if a cell is empty before reading
if (!ws["A1"].IsEmpty)
{
Console.WriteLine(ws["A1"].StringValue);
}
// Provide a fallback value using a null-coalescing pattern
string cellText = ws["A1"].StringValue ?? "Default Value";
// Iterate a range and skip empty cells
foreach (var cell in ws["A1:A20"])
{
if (!cell.IsEmpty)
{
Console.WriteLine(cell.Text);
}
}Imports IronXL
Dim workbook As WorkBook = WorkBook.Load("data.xlsx")
Dim ws As WorkSheet = workbook.DefaultWorkSheet
' Check if a cell is empty before reading
If Not ws("A1").IsEmpty Then
Console.WriteLine(ws("A1").StringValue)
End If
' Provide a fallback value using a null-coalescing pattern
Dim cellText As String = If(ws("A1").StringValue, "Default Value")
' Iterate a range and skip empty cells
For Each cell In ws("A1:A20")
If Not cell.IsEmpty Then
Console.WriteLine(cell.Text)
End If
NextThe read Excel file documentation covers additional patterns for handling sparse data, including how to detect the last used row and column in a worksheet.
Another consideration when dealing with empty cells is the difference between a truly blank cell and a cell that holds an empty string. IsEmpty returns true only when the cell contains no value at all, while StringValue returns an empty string for both blank cells and cells explicitly set to "". If your data has cells formatted as text that appear empty, check both IsEmpty and string.IsNullOrWhiteSpace(cell.StringValue) for the most accurate result.
How Do You Build a Production-Ready Excel Reader?
A real-world Excel reader needs file validation, error handling, multi-sheet support, and optional output generation. The following example demonstrates all of these patterns in a single class:
using IronXL;
using System.IO;
// Validate and load the file
static List<string> CheckLowStock(string filePath)
{
var lowStockItems = new List<string>();
if (!File.Exists(filePath))
{
Console.WriteLine($"File not found: {filePath}");
return lowStockItems;
}
string ext = Path.GetExtension(filePath).ToLower();
if (ext is not (".xlsx" or ".xls" or ".csv"))
{
Console.WriteLine($"Unsupported file type: {ext}");
return lowStockItems;
}
try
{
WorkBook workbook = WorkBook.Load(filePath);
foreach (WorkSheet sheet in workbook.WorkSheets)
{
Console.WriteLine($"Checking sheet: {sheet.Name}");
for (int row = 2; row <= sheet.RowCount; row++)
{
string itemName = sheet[$"A{row}"].StringValue;
int stockLevel = sheet[$"B{row}"].IntValue;
if (stockLevel < 10 && !string.IsNullOrEmpty(itemName))
{
lowStockItems.Add($"{itemName} -- {stockLevel} units ({sheet.Name})");
}
}
}
}
catch (Exception ex)
{
Console.WriteLine($"Error reading Excel file: {ex.Message}");
}
return lowStockItems;
}
// Export results to a new workbook
static void ExportReport(List<string> items, string outputPath)
{
WorkBook report = WorkBook.Create();
WorkSheet sheet = report.CreateWorkSheet("Low Stock Report");
sheet["A1"].Value = "Item Description";
sheet["B1"].Value = "Source Sheet";
sheet["A1:B1"].Style.Font.Bold = true;
sheet["A1:B1"].Style.BackgroundColor = "#4472C4";
sheet["A1:B1"].Style.Font.Color = "#FFFFFF";
int rowIndex = 2;
foreach (string item in items)
{
sheet[$"A{rowIndex}"].Value = item;
rowIndex++;
}
report.SaveAs(outputPath);
Console.WriteLine($"Report saved to: {outputPath}");
}
// Run
var lowStockItems = CheckLowStock("inventory.xlsx");
ExportReport(lowStockItems, "low-stock-report.xlsx");using IronXL;
using System.IO;
// Validate and load the file
static List<string> CheckLowStock(string filePath)
{
var lowStockItems = new List<string>();
if (!File.Exists(filePath))
{
Console.WriteLine($"File not found: {filePath}");
return lowStockItems;
}
string ext = Path.GetExtension(filePath).ToLower();
if (ext is not (".xlsx" or ".xls" or ".csv"))
{
Console.WriteLine($"Unsupported file type: {ext}");
return lowStockItems;
}
try
{
WorkBook workbook = WorkBook.Load(filePath);
foreach (WorkSheet sheet in workbook.WorkSheets)
{
Console.WriteLine($"Checking sheet: {sheet.Name}");
for (int row = 2; row <= sheet.RowCount; row++)
{
string itemName = sheet[$"A{row}"].StringValue;
int stockLevel = sheet[$"B{row}"].IntValue;
if (stockLevel < 10 && !string.IsNullOrEmpty(itemName))
{
lowStockItems.Add($"{itemName} -- {stockLevel} units ({sheet.Name})");
}
}
}
}
catch (Exception ex)
{
Console.WriteLine($"Error reading Excel file: {ex.Message}");
}
return lowStockItems;
}
// Export results to a new workbook
static void ExportReport(List<string> items, string outputPath)
{
WorkBook report = WorkBook.Create();
WorkSheet sheet = report.CreateWorkSheet("Low Stock Report");
sheet["A1"].Value = "Item Description";
sheet["B1"].Value = "Source Sheet";
sheet["A1:B1"].Style.Font.Bold = true;
sheet["A1:B1"].Style.BackgroundColor = "#4472C4";
sheet["A1:B1"].Style.Font.Color = "#FFFFFF";
int rowIndex = 2;
foreach (string item in items)
{
sheet[$"A{rowIndex}"].Value = item;
rowIndex++;
}
report.SaveAs(outputPath);
Console.WriteLine($"Report saved to: {outputPath}");
}
// Run
var lowStockItems = CheckLowStock("inventory.xlsx");
ExportReport(lowStockItems, "low-stock-report.xlsx");Imports IronXL
Imports System.IO
' Validate and load the file
Private Shared Function CheckLowStock(filePath As String) As List(Of String)
Dim lowStockItems As New List(Of String)()
If Not File.Exists(filePath) Then
Console.WriteLine($"File not found: {filePath}")
Return lowStockItems
End If
Dim ext As String = Path.GetExtension(filePath).ToLower()
If ext <> ".xlsx" AndAlso ext <> ".xls" AndAlso ext <> ".csv" Then
Console.WriteLine($"Unsupported file type: {ext}")
Return lowStockItems
End If
Try
Dim workbook As WorkBook = WorkBook.Load(filePath)
For Each sheet As WorkSheet In workbook.WorkSheets
Console.WriteLine($"Checking sheet: {sheet.Name}")
For row As Integer = 2 To sheet.RowCount
Dim itemName As String = sheet($"A{row}").StringValue
Dim stockLevel As Integer = sheet($"B{row}").IntValue
If stockLevel < 10 AndAlso Not String.IsNullOrEmpty(itemName) Then
lowStockItems.Add($"{itemName} -- {stockLevel} units ({sheet.Name})")
End If
Next
Next
Catch ex As Exception
Console.WriteLine($"Error reading Excel file: {ex.Message}")
End Try
Return lowStockItems
End Function
' Export results to a new workbook
Private Shared Sub ExportReport(items As List(Of String), outputPath As String)
Dim report As WorkBook = WorkBook.Create()
Dim sheet As WorkSheet = report.CreateWorkSheet("Low Stock Report")
sheet("A1").Value = "Item Description"
sheet("B1").Value = "Source Sheet"
sheet("A1:B1").Style.Font.Bold = True
sheet("A1:B1").Style.BackgroundColor = "#4472C4"
sheet("A1:B1").Style.Font.Color = "#FFFFFF"
Dim rowIndex As Integer = 2
For Each item As String In items
sheet($"A{rowIndex}").Value = item
rowIndex += 1
Next
report.SaveAs(outputPath)
Console.WriteLine($"Report saved to: {outputPath}")
End Sub
' Run
Dim lowStockItems As List(Of String) = CheckLowStock("inventory.xlsx")
ExportReport(lowStockItems, "low-stock-report.xlsx")This example uses top-level statements and covers the full workflow: validate the file path and extension, load the workbook, iterate all worksheets, apply business logic, and write results to a new file. For more about writing and saving workbooks, see the write Excel file guide and the export Excel how-to.
Notice that the ExportReport method creates a new workbook with WorkBook.Create() rather than modifying the source file. Keeping source and output files separate is a good practice for audit trails and avoids accidentally overwriting data that other processes depend on. If you need to append data to an existing workbook instead, load it with WorkBook.Load(), add rows to the appropriate worksheet, and call SaveAs() to a new path or overwrite in place.
How Do You Process Large Excel Files Efficiently?
For files with thousands of rows, aggregate functions outperform manual loops because they operate internally without materializing each cell as a separate object:
using IronXL;
WorkBook workbook = WorkBook.Load("large-dataset.xlsx");
WorkSheet ws = workbook.DefaultWorkSheet;
// Fast: aggregate functions operate on the range directly
decimal total = ws["B2:B5000"].Sum();
decimal average = ws["B2:B5000"].Avg();
int count = ws["B2:B5000"].Count();
Console.WriteLine($"Total: {total:C}, Average: {average:C}, Rows: {count}");
// Export the worksheet to a DataSet for LINQ or database operations
var dataSet = workbook.ToDataSet();
Console.WriteLine($"DataSet tables: {dataSet.Tables.Count}");using IronXL;
WorkBook workbook = WorkBook.Load("large-dataset.xlsx");
WorkSheet ws = workbook.DefaultWorkSheet;
// Fast: aggregate functions operate on the range directly
decimal total = ws["B2:B5000"].Sum();
decimal average = ws["B2:B5000"].Avg();
int count = ws["B2:B5000"].Count();
Console.WriteLine($"Total: {total:C}, Average: {average:C}, Rows: {count}");
// Export the worksheet to a DataSet for LINQ or database operations
var dataSet = workbook.ToDataSet();
Console.WriteLine($"DataSet tables: {dataSet.Tables.Count}");Imports IronXL
Dim workbook As WorkBook = WorkBook.Load("large-dataset.xlsx")
Dim ws As WorkSheet = workbook.DefaultWorkSheet
' Fast: aggregate functions operate on the range directly
Dim total As Decimal = ws("B2:B5000").Sum()
Dim average As Decimal = ws("B2:B5000").Avg()
Dim count As Integer = ws("B2:B5000").Count()
Console.WriteLine($"Total: {total:C}, Average: {average:C}, Rows: {count}")
' Export the worksheet to a DataSet for LINQ or database operations
Dim dataSet = workbook.ToDataSet()
Console.WriteLine($"DataSet tables: {dataSet.Tables.Count}")Converting to a DataSet is particularly effective when you need to run LINQ queries across multiple sheets or load data into a relational database. Each worksheet becomes a DataTable inside the DataSet, making it straightforward to work with existing data-access code. See the Excel to DataSet guide for full details.
How Do You Get a License and Deploy to Production?
IronXL is a commercial library with a free trial that allows full functionality during development and testing. For production deployments, you will need a valid license key. Details on licensing tiers, including developer, team, and enterprise options, are on the IronXL licensing page.
To apply a license key, set it before any IronXL calls:
IronXL.License.LicenseKey = "YOUR-LICENSE-KEY-HERE";IronXL.License.LicenseKey = "YOUR-LICENSE-KEY-HERE";Imports IronXL
IronXL.License.LicenseKey = "YOUR-LICENSE-KEY-HERE"The IronXL features overview summarizes all capabilities, from reading and writing files to creating charts, applying conditional formatting, and working with named ranges. The create Excel file guide and merge cells how-to are useful starting points for writing new workbooks.
For community discussions and questions about C# Excel automation, the Microsoft Q&A forums and Stack Overflow are good resources. The official NuGet package page provides version history and download statistics.
What Are the Key Takeaways for Opening Excel Files in C#?
IronXL removes the dependency on Microsoft Office entirely, making it practical to process Excel files on servers, in containers, and in cloud functions. The API follows a simple pattern: load a workbook, access worksheets by name or index, and read cells using typed accessors. Aggregate functions like Sum(), Avg(), and Max() handle large datasets without the overhead of manual iteration.
The library supports XLSX, XLS, CSV, and TSV formats, runs on .NET 10 and all recent .NET versions, and works cross-platform. Error handling is straightforward because IronXL throws standard .NET exceptions that you can catch with familiar try/catch patterns -- no COM interop error codes to decode. To explore all available options, start with the IronXL documentation home or try the open workbook how-to for a step-by-step reference.
Start a free IronXL trial to evaluate the library in your own projects without any commitment.
Frequently Asked Questions
How can I open an Excel file in VB.NET without Microsoft Office?
You can open and read Excel files in VB.NET without Microsoft Office by using the IronXL library. IronXL provides a straightforward way to work with Excel files without the need for Microsoft Office or complex Interop methods.
What are the benefits of using IronXL for Excel processing in VB.NET?
IronXL simplifies Excel processing in VB.NET by eliminating the need for Microsoft Office and avoiding complex COM references. It ensures compatibility across different environments such as servers and cloud platforms, and helps prevent version conflicts.
Is it possible to process both XLSX and XLS files using IronXL?
Yes, IronXL supports processing both XLSX and XLS file formats, allowing you to open, read, and manipulate these Excel files in your VB.NET applications.
Do I need to install any additional software to use IronXL?
No additional software is required to use IronXL for Excel file processing in VB.NET. IronXL is a standalone library that integrates directly into your VB.NET projects.
Can IronXL be used in cloud environments?
Yes, IronXL is designed to work seamlessly in cloud environments, avoiding the common issues with traditional Excel Interop methods that often encounter version conflicts on servers or cloud platforms.
How does IronXL handle Excel file compatibility?
IronXL ensures compatibility by supporting multiple Excel file formats such as XLSX and XLS, and by providing robust functionality to manipulate and process these files without relying on Microsoft Office.
Is IronXL compatible with different VB.NET versions?
IronXL is compatible with various versions of VB.NET, making it a versatile solution for developers working with different versions of the .NET framework.
What are the common challenges of using traditional Interop methods for Excel in VB.NET?
Traditional Interop methods often require Microsoft Office, involve complex COM references, and are prone to version conflicts, especially in server or cloud environments. IronXL offers a solution to these challenges by providing a more reliable and straightforward approach.
Can IronXL be used for Excel file manipulation, such as editing or exporting data?
Yes, IronXL provides functionality for not only reading Excel files but also for editing and exporting data, making it a comprehensive tool for Excel file manipulation in VB.NET.
Where can I find working code examples for using IronXL in VB.NET?
You can find working code examples for using IronXL in VB.NET in the IronXL documentation and tutorials, which provide step-by-step guidance on processing Excel files without Microsoft Office.
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