Like .DOCX Microsoft has also introduced .DOTX (Microsoft Office Open XML Document) file format in Office 2007 which is based on Open XML and uses ZIP compression for smaller file sizes. As usual .Dotx file can’t be opened with old version Microsoft office like Office 2003, XP, 2000 unless you have installed compatibility pack.
If you looking for solution to convert Dotx into Docx format then here is freeware DOTX to DOCX converter. DOTX to DOCX Converter is a useful tool that converts DOTX (Open Office XML templates) files to DOCX (Open Office XML documents) files.
Its intended purpose is to act as a kind of extension for the Office 2007 Compatibility Pack, which does not include support for DOTX files.
Dotx to Docx Converter
Download DOTX to DOCX Converter.