git Windows will diff docx files without any additional configuration but surprisingly, this is not the case for ODT files. This simple Window shell script and git attributes configuration allows for diffing ODT files with LibreOffice
Copy the script below locally, I use %USERPROFILE%\scripts as the reference destination in the Configure Git section below, but you can choose whatever you want replacing the path with your own throughout the document.
Waring: this script assumes that the there is no .txt file that matches the filename less extension of the ODT file being diffed. This is a temporary work around for the --cat option of soffice.exe not working as advertized. Bug 129713