The method or operation is not implemented when saving to RTF

GemBox.Document
1

In trying to use GemBox.Document to convert a document from docx to RTF I receive an exception: System.NotImplementedException: ‘The method or operation is not implemented.’

My code is:

var doc = DocumentModel.Load(wordFilename);
doc.Save(rtfFileName, SaveOptions.RtfDefault);

The full stack trace is:

at \u0003   .\b(NumberStyle \u000f)   
at \b   .\u000f(ListLevelForm
at \u000f, Int32 \b)   
at \b   .\u000f(Int32 \u000f, ListStyle \b)   
at \b   .\u0005()   
at \b   .\u0006()   
at \b   .\u000f()   
at GemBox.Document.RtfSaveOptions.67tg5rkvl9zwp8v7723mndgzuc3b4vj8​ \u000f(DocumentModel \u000f, Stream \b, String \u0006)   
at GemBox.Document.SaveOptions.67tg5rkvl9zwp8v7723mndgzuc3b4vj8​ \u000f(DocumentModel \u000f, Stream \b, String \u0006, Boolean \u0002)   
at GemBox.Document.DocumentModel.Save(String path, SaveOptions options)

I have tried with v2025.3.113 and v2025.5.105. The document in question is relatively simple and I’m happy to share it.

This happens in my code as well as directly on your website:

Untitled
Untitled914×439 17.4 KB

2

Hi Craig,

Yes, please send us your DOCX file so we can reproduce the issue and investigate it.

Regards,
Mario

3

What is the best way to send you a docx file?

4

Hi Craig,

You can send us via email or support ticket.
Please check our Contact page.

Regards,
Mario

5

Please try again with this NuGet package:

Install-Package GemBox.Document -Version 2025.5.120-hotfix

Note that this is a hidden (unlisted) version. To install it, you’ll need to run the above command on the NuGet Package Manager Console (Tools → NuGet Package Manager → Package Manager Console).

Does this solve your issue?

Regards,
Mario