Cannot insert EPS files in docx documents
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The documentation on wiring was prepared in docx format to allow the use 
of monospaced fonts (Lucida Sans Typewriter) and for easier modifications.

However, it turns out that, starting with Office 2010, Microsoft has 
dropped support for EPS files:

Because of a security vulnerability in EPS files, Microsoft has turned 
off the ability to insert EPS files into Office documents.
If you attempt to insert an EPS file into an Office document, you'll only 
get an image placeholder with a message that says the picture can't be displayed.

As substitutes for EPS files, Microsoft recommends EMF and SVG, with are 
both graphics metafile formats.

File Type   Supported by this version of Office
-----------------------------------------------
EMF         Office 2007, 2010, 2013, 2016, and Microsoft 365
SVG         Microsoft 365

Note that SVG can only by copied and pasted from Internet Explorer. 
However, the resulting image in docx is not a vector image.

Consequently, the only alternative to EPS remains EMF.
To convert the original EPS file to EMF, either export it directly from 
xfig to EMF, or use an online conversion tool such as CloudConvert.com 
or Convertio.co, both of which can convert an EPS file to EMF or SVG.

The EMF file is imported as a vector image and the final pdf can be 
scaled without loss of quality.

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https://support.microsoft.com/en-us/office/support-for-eps-images-has-been-turned-off-in-office-a069d664-4bcf-415e-a1b5-cbb0c334a840

https://cloudconvert.com
https://convertio.co