SharePoint Designer file
File type: Various data file
A .spdesignhtt file is a SharePoint Designer file associated with Microsoft Office SharePoint Designer.
It is application data used when creating or modifying Microsoft SharePoint sites and web pages.
File type category:
Various data file
Date updated: September 27, 2026
Microsoft Office SharePoint Designer is a specialized HTML editor and web design program for creating and modifying Microsoft SharePoint sites and web pages. The .spdesignhtt file belongs to that software and supports its SharePoint site and page design work.
This is a legacy Windows application file rather than a general-purpose HTML document. Office SharePoint Designer is no longer actively developed, and the format is mainly encountered in older SharePoint environments.
Open a .spdesignhtt file on Windows with Microsoft Office SharePoint Designer. Launch the program and open the file from within the application, or open the associated SharePoint site or project if the file is part of that work.
If the file does not open by itself, it may be supporting application data rather than a standalone document. In that case, use the Office SharePoint Designer installation and SharePoint site context that created it.
Open the file or its associated site in Office SharePoint Designer and use the application's available save, publish, or export functions for the relevant SharePoint content.
Renaming the file to another extension does not convert its contents.
Software applications that handle other tasks involving spdesignhtt files:
Microsoft Windows
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