The file list in "Save As" dialog box has been changed in V11.0.0 or later for Windows.
Content
Files that have a different extension from the Excel book name specified as first parameter, are not shown in "Save As" dialog.
Action
Multiple pairs of filename extensions are specified in the file dialog box filter specified as third parameter. For example, "Excel Workbook (*.xlsx)" and "All Files (*.*)" are specified in pairs as follows.
"Excel Workbook(*.xlsx),*.xlsx,All Files(*.*),*.*"
All files are shown in "Save As" dialog box by selecting "" from extension list.