/usr/share/metview/etc/MIMPORTDef is in metview-data 4.8.0-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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{
   IMPORT_FILE_NAME
   {
      @
   } = ''
   IMPORT_FILE [
         interface       = icon,
         class           = PNG,
         missing         = ignored,
         help            = help_data,
         help_name       = PNG,
         help_directory  = '/System/Defaults',
         help_class      = PNG
         #help_definition = ( PNG,AXIS_ORIENTATION = 'VERTICAL')
        ]
   {
       @
   }
   IMPORT_FORMAT
   {
      PNG;PNG
      JPEG;JPEG
      GIF;GIF
   } = PNG
   IMPORT_X_POSITION
   {
      *
   } = 0
   IMPORT_Y_POSITION
   {
      *
   } = 0
   IMPORT_WIDTH
   {
      *
   } = -1
   IMPORT_HEIGHT
   {
   *
   } = -1
}
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