A reader asks:

“To set bVistaStyle to FALSE, under which OS, we need to compile my project.
[…]
in the MSDN I found that the “This parameter is applicable only if you are compiling in Windows Vista.”
Please see the following MSDN link: http://msdn.microsoft.com/en-us/library/wh5hz49d.aspx
Kindly let us know your feedback on this.”

I took a look at the documentation and it does indeed say that.  However, the documentation is incorrect.

There are no #defines or #pragmas around the constructor for CFileDialog that would restrict the OS at compile time.  What they may be intending to say is that the parameter is applicable only if you are running in Windows Vista.

I wrote a test program that shows a CFileDialog and I explicity set the bVistaStyle flag to TRUE.  I Compiled it on XP and I got the XP-style file open dialog (which is to be expected).  I then copied the EXE to my Vista computer (I did not recompile).  There, I got the Vista style dialog.

So you can safely compile on XP and it will still show the Vista dialog on Vista.

Note that this is restricted to Visual Studio 2008.  The parameter is not present in Visual Studio 2005 (out of the box).