dplayx: Corrected the way nameserver initializes the sessiondesc structure on broadcast request reply.

Get rid of the open_named_pipe request, we can now use a normal open_file_object.

Get rid of the open_mailslot request, we can now use a normal open_file_object.

Don't map NT namespace 1:1 to Unix, add a magic \??\unix device instead.
More generic support for \??\ devices, with fallback to the wineserver
for paths that don't exist.

Revert 7c35db07c35db0... msiexec: Use CommandLineToArgvW instead of process_args to reduce code duplication.

The previous command line processing is not identical to
CommandLineToArgvW and CommandLineToArgvW breaks msi command line
processing for things such as Excel Viewer 2003.

Specifically the command line created by the Excel Viewer 2003 and
passed to msiexec.exe is "c:\windows\system32\msiexec.exe" /I
C:\windows\temp\IXP000.TMP\XLVIEW.MSI CDCACHE="2"
LAUNCHEDFROMSETUP="1" SETUPEXEPATH="C:\windows\temp\IXP000.TMP\"
SETUPEXENAME="SETUP.EXE" /lpiwaeo "C:\windows\temp\Microsoft Office
Excel Viewer 2003 Setup(0001)_Task(0001).txt" CDCACH"...

Add a hack for WM_GETTEXT in RichEdit20W class when running in win9x emulation mode.

user32: WM_GETTEXT message converters have to 0-terminate output buffer if there is enough space even if there is no text to convert.

Add appropriate symlinks to them in the \?? directory.