CVE-2018-16858 (LibreOffice Remote Code Execution)

Hi there!

I'm a little stumped on what 9 is prompting me to do? 

So it's asking me to open and modify 'bankdetails.odt' and to launch the file as 'cmd.exe' instead of .docx file, but when I right click on the 'bankdetails.odt' I don't really know what to select from the list to open as an extension as a .exe?

Hope i've made sense?