Microsoft Expression Web file
File type: Various data file
An xweb4web file is a Microsoft Expression Web project or website data file.
It belongs to Microsoft Expression Web, a Windows application for creating and managing websites and web applications.
File type category:
Various data file
Date updated: October 4, 2026
Record marked as obsolete and not updated for a long time.
The xweb4web file extension is associated with Microsoft Expression Web, a website design and management application developed by Microsoft for Windows.
An xweb4web file contains site-specific data used by Expression Web. It is part of the application's website project data rather than a standard web page format such as HTML.
Microsoft Expression Web and this file format are obsolete and are no longer actively developed. The file may still be useful when working with an older Expression Web website.
Open an xweb4web file with Microsoft Expression Web on Windows. The file may need to remain with the other files from the associated Expression Web website for the project to open correctly.
Because Expression Web is obsolete, compatible software may not be available on newer systems. If the file does not open by itself, open the related website project from within Expression Web instead.
Use Microsoft Expression Web to open the associated website and publish or export the website's individual pages and assets in their standard formats.
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