How To wright Long filenames in "Content-Disposition: attachment; filename" in one line with out the file being writen to a new line

[Oryx101]

Describe the bug
Hi this is a question regarding the long file name in Content-Disposition

I have the following results

--=-bZKVCIXpY0l5CEODeHPLgg==
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
Content-Transfer-Encoding: base64

QUFBDQo=

--=-bZKVCIXpY0l5CEODeHPLgg==
Content-Type: application/octet-stream;
	name*0="This_IS_abcdefg_CTU_ABCDEFGHIKLMNOP__Bordereaux_(AUG-2012)_COMM_4";
	name*1="30 - Test This Services Services_2023-07-21_1042.xlsx"
Content-Disposition: attachment;       
	filename*0="This_IS_abcdefghijklm_CTU_ABCDEFGHIKLMNOP__Bordereaux_(AUG-2012)_CO";
	filename*1="MM_430 - Test This Services_2023-07-21_1042.xlsx"
Content-Transfer-Encoding: base64

How can I keep the Content-Disposition filename on one line...

something like this:

Content-Disposition: attachment;       
	filename*0="This_IS_abcdefghijklm_CTU_ABCDEFGHIKLMNOP__Bordereaux_(AUG-2012)_COMM_430 - Test This Services_2023-07-21_1042.xlsx"
Content-Transfer-Encoding: base64

Platform (please complete the following information):

• OS: Windows
• .NET Version: 2022 version 17.6
• MimeKit Version: 2.9.0.0

Additional context
I know it seems like a simple question but something I have been struggling with
solutions I have tried

changing the ContentDisposition Encoding
FormatOptions MaximumLineLength
and manipulating the ContentDisposition filename after the fact

this did not work or i implemented the solutions at the wrong place

[jstedfast]

This isn't possible to do with MimeKit, it will always (properly) fold long header lines.