The Open file dialog box allows the user to select a configuration file for opening.
The dialog box shows the list of configuration filenames available in the current directory, using the default extension .BRC. An alternative drive and/or directory may be selected from the listboxes provided, and a suitable filename entered into the edit box.
Pushing the OK button causes the file to be loaded, while pushing the Cancel button cancels the operation and leaves the previous configuration unchanged.

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