.XHTM File Extension
Extensible Hypertext Markup Language Document
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What is an XHTM file?
An XHTM file is a webpage file written in XHTML, a reformulation of HTML 4 that uses XML 1.0. It includes standard HTML tags, which must adhere to more strict XML guidelines. XHTM files are used for publishing website content.
XHTML files more commonly use the .XHTML extension.