MarsSeed [1] filed a deletion request for winconn [2]: Orphan, unused Python2 based GUI frontend for FreeRDP, discontinued since 2012.
Not useful to keep. There are good alternatives, including ones like Remmina, available in repo. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/winconn/
