1. wxFileDialog patch for multiple selection applied (with some small changes),

added demo for it in the sample and documented
2. wxMimeTypeManager works a bit better under Windows (doesn't ignore the
   extensions without filetypes)


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4850 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/filedlg.h

@@ -1,6 +1,16 @@
 #ifndef _WX_FILEDLG_H_BASE_
 #define _WX_FILEDLG_H_BASE_
 
+enum
+{
+    wxOPEN  = 1,
+    wxSAVE = 2,
+    wxOVERWRITE_PROMPT = 4,
+    wxHIDE_READONLY = 8,
+    wxFILE_MUST_EXIST = 16,
+    wxMULTIPLE = 32
+};
+
 #if defined(__WXMSW__)
 #include "wx/msw/filedlg.h"
 #elif defined(__WXMOTIF__)