Backup files with 4 character extension

Currently have WD Smartware version 2.4.16 and I have office files that are created with 4 char extensions, xlxs and .docx. They can’t be saved or retrieved. Any suggestioins??


A file with the DOCX file extension is a Microsoft Word Open XML Format Document file. DOCX files are XML-based and can contain text, objects, styles, formatting, and images, all of which are stored as separate files and ultimately compacted in a single, ZIP-compressed DOCX file.

I believe WD Smartware does not backup this type of files.