id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	blockedby	blocking	notify_on_close	platform	project
3946	Make OpenFileNameArg check that file exists	Tom Goddard	Eric Pettersen	"Would be convenient if OpenFileNameArg checked that the file exists so all the code that takes file paths don't have to do their own checks.

Eric says that the open command is currently using OpenFileNameArg to accept database ids so that would have to be changed to use a new FileOrIdArg.
"	enhancement	closed	moderate		Input/Output		fixed						all	ChimeraX