The Options Files Selection list box specifies the list of options files
 to choose from to add to the left-hand list box.

 By default, the list will contain files with the file type .OPT which are
 found in the current default directory.

 If there are Options Files defined for the current context, they will be
 reflected when the dialog box come up, and they will take precedence
 over the default initialization.

 Files can be moved to the left-hand list in three ways:

     o double-click on a file specification

     o highlight a file specification, then click on the left arrow button

     o click on the All button, which will move all the files from the
        right-hand box to the left-hand box