TCnOpenFileDialog.AddExtension Property
Gets or sets a value indicating whether the dialog box automatically adds an extension to a file name if the user omits the extension.
published property AddExtension: Boolean read GetAddExtension write SetAddExtension default True;
Property Value
true if the dialog box adds an extension to a file name if the user omits the extension; otherwise, false. The default value is true.
The extension added to a file name depends on the currently selected
file filter and the value of the CheckFileExists property.
If the CheckFileExists property is true, the dialog box adds the first
extension from the current file filter that matches an existing file.
If no files match the current file filter, the dialog box adds the
extension specified in the DefaultExt property.
If the CheckFileExists property is false, the dialog box adds the first
valid file name extension from the current file filter. If the current
file filter contains no valid file name extensions, the dialog box adds
the extension specified in the DefaultExt property.