Microsoft Office SharePoint Designer file
File type: Various data file
An spdesignstm file extension identifies a data file associated with Microsoft Office SharePoint Designer.
The file belongs to the Windows version of Microsoft's SharePoint site design and editing software.
File type category:
Various data file
Date updated: October 4, 2026
Record marked as obsolete and not updated for a long time.
Microsoft Office SharePoint Designer was a discontinued freeware HTML editor for creating and modifying Microsoft SharePoint sites. The software was available for Microsoft Windows.
An spdesignstm file stores data used by Office SharePoint Designer. It is an internal, software-specific file rather than a general-purpose document format.
The format is obsolete because Office SharePoint Designer is discontinued, so these files are unlikely to be created by current software.
Open the spdesignstm file with Office SharePoint Designer on Microsoft Windows. The file may not open as a standalone document because it contains data used by the software.
Software applications that handle other tasks involving spdesignstm files:
Microsoft Windows
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