Peter's suggestion is a good possibility.

The programmer may have specified the accelerator key (Alt+key), but forgot
to add the "&" to the field label, causing the form to look like there is
no accelerator key, when in fact there is one. Try all of the letters in
"Destination folder", or whatever the field is labeled (i.e. Alt+D, Alt+e,
Alt+s, etc.).

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Regards,
Bill Renaud