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frame<-open_file
frame <-open_file: filters=[chain], default=[char_array], allow_many=[bool] -> name|chain
Use the OS file-open dialog to prompt for a file. Arguments:

  • filters — chain of tuple objects, each tuple(Name, Extensions) where Extensions is a ;-separated list or a chain of char_array. Example:

    chain(tuple('Prolog', chain(pl,prolog))).

  • default — absolute file name used as initial selection.
  • allow_many — if @on, allow multi-select and return a chain of file names; otherwise return a single name.
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