:e a.txt (edit) 或者 :split a.txt (split) 或者 :vsplit a.txt (vertical split)

how to navigate to the path like c:\user\......\b.txt?

tried tab for auto complete, no luck....

tab for autocomplete should work ka wo.. try :e <tab> ?

:e <tab> -> :e ^I

no auto complete

that's strange.. maybe your vimrc has some problems; or did you copy it from another OS ?