Convert MS Word 2007 to 2003 - Version 3.2 Are you trying to open Docx file in MS Word2003? You definitely face “This file is not in a recognizable format” error as you open this file because MS Word 2003 has no definition of Docx format. Do you know that How to convert Docx to Doc? Using SysTools Docx Repair Software, you can easily convert Docx to Doc file. If you want to open MS Word 2007 file to 2003, you have to convert MS Word 2007 to 2003 file because MS Word 2003/ 2002/XP etc preferred Doc & RTF format. That's why if we try to open Docx file in MS Word 2003, it will unrecognized Docx format and "This file is not in a recognizable format" error message will be appeared. SysTools Docx Repair tool enable you to Convert Docx File. Software converts Docx to Docx & RTF. Now the question arises that how to Convert Docx to Doc. Using this software, you can access your RTF file in MS Word 2003. You can use "Save As" option to convert RTF format to Doc format. SysTools Docx Repair Tool efficiently recover Docx file when the following error messages appears." Unable to read word document Files.