I found a strange behavior on completing a filename argument after alias command defined by doskey.
This occurs when the filename body is a built-in command name, like 'ver', 'dir', 'time', etc.

Situation:

• only the file 'ver.txt' exists in the current directory.
• command 'dir' is a normal non-alias command.
• command 'aaa' is an alias command via doskey.
• do TAB completion after partial input.

Behavior:

BTW, these hehavior does not occur on 2nd. or later argument.