Resolving Line Spacing, Font and Font Size Changes in DocxFormatProvider Export

Environment

Version	Product	Author
2025.4.1104	RadPdfProcessing	Desislava Yordanova

Description

When using the DocxFormatProvider to import, modify, and export DOCX documents, the exported file may exhibit unexpected changes in the Normal style properties, such as font, font size, and line spacing. These inconsistencies are caused by the glossary folder in the DOCX archive, which contains a secondary styles.xml file that overrides the main styles.xml file.

This knowledge base article also answers the following questions:

• How do I prevent style changes during DOCX export with DocxFormatProvider?
• Why does my exported DOCX file have different font and spacing?
• How can I fix Normal style changes caused by DOCX glossary content?

Solution

To prevent style changes during DOCX export, remove the glossary folder from the DOCX archive before processing the document. Use the Telerik ZipLibrary to programmatically delete the glossary folder. Below is an example implementation:

using System.IO;
using Telerik.Windows.Zip;
using Telerik.Windows.Documents.Flow.FormatProviders.Docx;

string path = @"sample_document.docx";
using (Stream str = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite))
{
    using (ZipArchive archive = ZipArchive.Update(str, null))
    {
        foreach (ZipArchiveEntry entry in archive.Entries.ToList())
        {
            if (entry.FullName.StartsWith("word/glossary"))
            {
                entry.Delete(); // Remove glossary folder entries
            }
        }
    }

    DocxFormatProvider provider = new DocxFormatProvider();
    var flowDocument = provider.Import(str, null); // Process document after cleanup
}

Key Points:

1. The word/glossary folder is deleted to prevent it from overriding the main style definitions.
2. Use Telerik's ZipLibrary for efficient DOCX archive modification.
3. Process the cleaned document with the DocxFormatProvider.

See Also

• DocxFormatProvider
• Updating Zip Archives with ZipLibrary