Microsoft Expression Web file
File type: Various data file
A .xweb4open file is a data file associated with Microsoft Expression Web, Microsoft's web design and development software for Windows.
File type category:
Various data file
Date updated: October 4, 2026
Record marked as obsolete and not updated for a long time.
Microsoft Expression Web was used to create and manage web pages and web applications. An .xweb4open file stores data used by the Expression Web application.
The format belongs to the Expression Web software rather than to the web pages themselves. Expression Web is obsolete and is no longer actively developed, so these files are unlikely to be created by current software.
Open the file on Windows with Microsoft Expression Web, if the application recognizes it. Some files of this type may be supporting data for an Expression Web site rather than documents intended to be opened independently.
If Expression Web is unavailable, there may be no current application that can open the file directly.
There is no generally applicable conversion for an .xweb4open file. It is supporting data for Expression Web, not a standard web document format.
If the related site is still available, open it in Expression Web and export or publish the site's web pages using the formats supported by that application.
Language