Member variable XbpFileDialog():defExtension Foundation
Default extension of a file selected by the user
The :defExtension instance variable optionally specifies the default extension for files selected in the file dialog. The extension is appended automatically to the file name(s) if the user fails to explicitly specify an extension. The string should not contain a period (.). If :defExtension contains the empty string (""), no extension is appended and the file name is returned exactly as it was typed in the file dialog.
Although the string assigned to :defExtension can be of any length, only the first three characters are recognized by Windows.
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