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 DIR$[(filespec$)]
 
 Usage Notes
   ■ If you omit filespec$ when you first call DIR$, Visual Basic generates
     the error message, "Illegal Function Call."
 
   ■ DIR$ returns the first file name that matches the filespec$ you specify.
     To retrieve additional file names that match the filespec$ pattern, call
     DIR$ again with no argument. When no file names match, DIR$ returns a
     null string.
 
  ■ You do not have to retrieve all the file names that match a given
     filespec$ before calling DIR$ again with a new filespec$.
 
   ■ DIR$ is not case sensitive ("C" is the same as "c").
 
   ■ Because file names are retrieved in no particular order, you may want
     to store file names in a dynamic array and sort the array.