user32: Implement GetWindowModuleFileName with tests (try 2)

[Dmitry Timoshkov]

"Dmitry Timoshkov" <dmitry at codeweavers.com> wrote:

>> This won't work across processes.
> 
> Looks like GetWindowModuleFileName is not supposed to work for other
> process windows, at least in the following snippet both GetWindowLongPtr
> and GetWindowModuleFileName return 0 but don't change the last error value
> under XP although FindWindow returns a valid window handle:

AF in the bug 10002 pointed out to http://support.microsoft.com/kb/228469
which explains that.

-- 
Dmitry.