EDIT:
Cross platform desktop and web-based vector graphics editor. Looks fairly mature and has a single executable, but relies on a web connection to save files. After first launch, it requires a login.
https://vectr.com/
http://www.softpedia.com/get/Multimedia ... ectr.shtml
Status: writes settings (and just about everything else) to AppData/Vectr and AppData/Roaming/Vectr.
Screenshot: https://vectr.com/images/press/product/ ... editor.jpg
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Feb 2024 EDIT: Program last updated in 2017. The service and website went to a for-pay web-based graphic option ala Canva.