Windows build thinks xdg-open can be used to open a web browser
For some reason windows/include/config.h has the following:
/* Command to open a browser on a URL */
#define BROWSER "xdg-open"
xdg-open is a Linux thing and it seems clear this is intended to read start
, like in cmake/config_checks.cmake. I haven't seen any users reporting this, so maybe this is currently unused.