Your bug report

#40649: VM image file lacks ".qcow2" extension, which confuses GNOME Boxes

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 40649@debbugs.gnu.org.

-- 
40649: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=40649
GNU Bug Tracking System
Contact help-debbugs@gnu.org with problems