FileFilterStr
Optional: A string of comma-delimited filter pairs used to control which files are initially displayed. For example, "Text Files,*.txt, Bitmap Files,*.bmp". If omitted then the "All Files,*.*" filter is used.
FilterIndexVal
Optional: The zero-based index of the filter to use.
TitleStr
Optional: Title to display in the dialog caption. If omitted, the caption displays “Open".
ButtonTextStr
Optional: Custom text to display in the select button. If omitted, the button displays "Open".