Microsoft Word introduced the .docx file extension since 2007, and since then it has become one of the main standard formats for documents across the board. Even so, people using older word processing software and those who aren’t using the Windows operating system may have trouble when required to use it.
Fortunately, there are a number of options available, from using another type of freely available software that can handle a .docx file, to converting it to a different file type using an online converter.
Use a Different Word Processor
There are a number of different word processing applications out there that can open .docx files, and can also save them as a different file type. You may find that using them can result in some of the formatting being lost or altered, but you will at least be able to get to the main content of the file.