Maybe the mime type for .svg is set incorrectly in the registry. It displays broken for me too if it set it to plain/text.
- Open the Start menu and type
regedit
to open Registry Editor - In the address bar paste
Computer\HKEY_CLASSES_ROOT\.svg
and press Enter to quickly go to it. - If the Content Type is set to
text/plain
, set it toimage/svg+xml
- Restart Anki.