SharePoint Designer file
File type: Internet related file
The .spdesignopen file is associated with Office SharePoint Designer, Microsoft's specialized HTML editor and web design program for creating and modifying SharePoint sites and web pages.
It is a SharePoint Designer application file rather than a standalone HTML document.
File type category:
Internet related file
Date updated: September 27, 2026
Office SharePoint Designer was a Windows application from Microsoft for designing, editing, and managing Microsoft SharePoint sites and their web pages. The .spdesignopen format belongs to that application and its SharePoint site-editing workflow.
The file is intended to be handled by SharePoint Designer on Microsoft Windows. It is a legacy format associated with the discontinued standalone SharePoint Designer product, rather than a current general-purpose web document format.
Open the file with Office SharePoint Designer on Microsoft Windows. The supported workflow is to open the related SharePoint site or project in SharePoint Designer; the file is not intended to be viewed as an HTML page in a web browser or text editor.
There is no standard standalone conversion for an .spdesignopen file. If the goal is to preserve SharePoint content, open the related site in Office SharePoint Designer and use its site-management, save, or publishing features rather than converting this file with a generic converter.
Software applications that handle other tasks involving spdesignopen files:
Microsoft Windows
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