[media-types] [IANA #1456008] application/prs.ktb+zip registration request

Hi Darrel, 

Sending a reminder for this request from July 21st. 

Thanks,
Amanda

On Tue Jul 21 09:47:44 2026, amanda.baber wrote:
> Hi Darrel,
> 
> Here's an updated version of the form that includes a Windows
> clipboard name field.
> 
> thanks,
> Amanda
> 
> Name: Abdulrahman Waleed
> 
> Email: [email protected]
> 
> Media type name: application
> 
> Media subtype name: prs.ktb+zip
> 
> Required parameters: N/A
> 
> Optional parameters: N/A
> 
> Encoding considerations: binary
> 
> Security considerations:
> 
> (1) the format contains html which can contain javascript but the
> application that uses it should be a word processor and html should be
> used only to embed text into the pages so that the execution of
> malware is impossible.
> (2) The format does not privacy services, it is a document file that
> if the user wants it private it is the user's responsibility to store
> it safely or encrypt it.
> (3) It inherits all security considerations of JSON and ZIP archives.
> (4) The file type may contain standard HTML hyperlinks. These links
> are not structurally required to render or interpret the core text of
> the document.
> 
> Interoperability considerations: Interoperability is limited to
> applications that implement support for this specific archive
> structure.
> 
> Software must be able of decompressing a standard ZIP and parsing the
> internal HTML content (A subset of HTML 4 https://doc.qt.io/qt-
> 6/richtext-html-subset.html) and custom JSON metadata files.
> 
> Published specification: https://github.com/abdulrahman-103/Kitab
> 
> Applications which use this media: The "Kitab" word processor uses
> .ktb files where it is a ZIP containing an HTML file for pages content
> and a JSON file for document metadata such as page size and margins.
> https://github.com/abdulrahman-103/Kitab
> 
> Fragment identifier considerations: Fragment identifiers are not used
> or defined for this file format.
> 
> Restrictions on usage: There are no restrictions.
> 
> Provisional registration? (standards tree only): No
> 
> Additional information:
> 
> 1. Deprecated alias names for this type: N/A
> 2. Magic number(s): 50 4B 03 04
> 3. File extension(s): .ktb
> 4. Macintosh file type code: N/A
> 5. Object Identifiers: N/A
> 6. Windows clipboard name: Kitab Document
> 7. MacOS Uniform Type Identifier: org.kitab.document
> 
> Person to contact for further information:
> 
> 1. Name: Abdulrahman Waleed
> 2. Email: [email protected]
> 
> Intended usage: LIMITED USE
> 
> This file format is for the Kitab word processor and it is currently
> the only app and word processor that uses this file extension.
> 
> Author/Change controller: Abdulrahman Waleed, [email protected]
> 
> On Fri Jul 17 01:11:00 2026, david.dong wrote:
> > Hi Darrel,
> >
> > Can you review this new request for us by July 30th?
> >
> > Thank you.
> >
> > Best regards,
> >
> > David Dong
> > IANA Services Sr. Specialist
> >
> > --
> >
> > Name: Abdulrahman Waleed
> >
> > Email: [email protected]
> >
> > Media type name: application
> >
> > Media subtype name: prs.ktb+zip
> >
> > Required parameters: N/A
> >
> > Optional parameters: N/A
> >
> > Encoding considerations: binary
> >
> >
> >
> > Security considerations: (1) the format contains html which can
> > contain javascript but the application that uses it should be a word
> > processor and html should be used only to embed text into the pages
> > so
> > that the execution of malware is impossible.
> > (2) No, the format does not privacy services, it is a document file
> > that if the user wants it private it is the user's responsibility to
> > store it safely or encrypt it.
> > (3) N/A
> > (4) It inherits all security considerations of JSON and ZIP archives.
> > (5) The file type may contain standard HTML hyperlinks. These links
> > are not structurally required to render or interpret the core text of
> > the document.
> >
> > Interoperability considerations: Interoperability is limited to
> > applications that implement support for this specific archive
> > structure.
> > Software must be able of decompressing a standard ZIP and parsing the
> > internal HTML content (A subset of HTML 4 https://doc.qt.io/qt-
> > 6/richtext-html-subset.html) and custom JSON metadata files.
> >
> > Published specification: https://github.com/abdulrahman-103/Kitab
> >
> > Applications which use this media: The "Kitab" word processor uses
> > .ktb files where it is a ZIP containing an HTML file for pages
> > content
> > and a JSON file for document metadata such as page size and margins.
> > https://github.com/abdulrahman-103/Kitab
> >
> > Fragment identifier considerations: Fragment identifiers are not used
> > or defined for this file format.
> >
> > Restrictions on usage: There are no restrictions.
> >
> > Provisional registration? (standards tree only): No
> >
> > Additional information:
> >
> > 1. Deprecated alias names for this type: N/A
> > 2. Magic number(s): 50 4B 03 04
> > 3. File extension(s): .ktb
> > 4. Macintosh file type code: N/A
> > 5. Object Identifiers: N/A
> >
> > General Comments: N/A
> >
> > Person to contact for further information:
> >
> > 1. Name: Abdulrahman Waleed
> > 2. Email: [email protected]
> >
> > Intended usage: LIMITED USE
> >
> > This file format is for the Kitab word processor and it is currently
> > the only app and word processor that uses this file extension.
> >
> > Author/Change controller: Abdulrahman Waleed,
> > [email protected]

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