What is a file named 'PO.CXML' in images folder?

If we see the VxRAIL 3.5 FRU Node Replace Procedure provided from SolveDesktop. We can see the following description.

c.Right click on “EMC******service-datastore1” and select “Browse datastore”.

d.In the images folder, if there exists a file named ‘PO.CXML’, please download it to a local folder to backup the file for later use:

Actually, I couldn't discover a file, which is named 'PO.CXML' in images folder, on VxRAIL 3.5 code. Could you please let me know about what the file is? And  could you please tell me about where I could get the file?

Thanks!