-\twocolitem{{\bf wxOPEN}}{This is an open dialog (Windows only).}
-\twocolitem{{\bf wxSAVE}}{This is a save dialog (Windows only).}
-\twocolitem{{\bf wxHIDE\_READONLY}}{Hide read-only files (Windows only).}
-\twocolitem{{\bf wxOVERWRITE\_PROMPT}}{Prompt for a conformation if a file will be overridden (Windows only).}
+\twocolitem{{\bf wxOPEN}}{This is an open dialog.}
+\twocolitem{{\bf wxSAVE}}{This is a save dialog.}
+\twocolitem{{\bf wxHIDE\_READONLY}}{For open dialog only: hide the checkbox allowing to open the file in read-only mode.}
+\twocolitem{{\bf wxOVERWRITE\_PROMPT}}{For save dialog only: prompt for a confirmation if a file will be overwritten.}
+\twocolitem{{\bf wxMULTIPLE}}{For open dialog only: allows selecting multiple files.}
+\twocolitem{{\bf wxCHANGE\_DIR}}{Change the current working directory to the directory where the file(s) chosen by the user are.}