In my machine with Windows XP and Python 3.3.0 both variants work, the only
difference being that

'c:/
brings up the selection box authomatically and

'c:\

requieres that it be summoned with the tab key, as indicated.

2012/10/12 Terry J. Reedy <report@bugs.python.org>

>
> Terry J. Reedy added the comment:
>
> This patch (I suspect it is this one) disabled the use of '/' in filenames
> on windows when using filename completion.
>
> 'c:\   <wait, tab, ^space bring up box> in 3.2.3 and 3.3.0>
> (If there is no 'r' prefix, it really should require '\\' to be safe.)
>
> "c:/   ditto for 3.2.3.
> In 3.3.0, (and, I presume, 3.2.4 if not changed) tab inserts spaces to
> next tab stop, while ^space is ignored.
>
> Since using '/' is recommended over unsafe '\', this is an undesireable
> regression.
>
> ----------
> resolution: fixed ->
> stage: patch review -> needs patch
> status: closed -> open
> versions: +Python 3.3, Python 3.4
>
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> Python tracker <report@bugs.python.org>
> <http://bugs.python.org/issue14937>
> _______________________________________
>