The .wpostx file extension is used for a proprietary document file format that was developed by Microsoft Corporation. These WPOSTX files are also known as Microsoft Windows Live Writer post files. A .wpostx document may contain saved text, formatting attributes and digital multimedia content that can be added to blog posts. These WPOSTX files are generated by the Windows Live Writer software, which is a desktop blog publishing tool that was also developed by Microsoft Corporation. This software is bundled with other tools and utilities in the Windows Essentials suite of programs. The Windows Live Writer software can be used to create, edit and view the content of these .wpostx documents. There are no known applications that are capable of exporting or converting these WPOSTX files to other standard document file formats.
Unfortunately we have not received enough suggestions for software that can open WPOSTX files yet.
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If you have additional information about the WPOSTX file format or software that uses files with the WPOSTX suffix, please do get in touch - we would love hearing from you.