There is only one file type that uses the .TMVX extension:
TextMaker Document Template
A TMVX file is a document template created by TextMaker, a sword processing program included with Softmaker Office. It may store text, drawn objects, tables, images, and page formatting information. TMVX files are used to create .TMD and .TMDX documents with the same formatting or content.
Updated: January 23, 2018