[NumLock]

если щелкнуть мышкой на предупреждении Unit 'FileCtrl' is specific to a platform и нажать F1 до появится справка:

Unit '<element>' is specific to a platform
The whole unit is tagged (using the platform hint directive) as one that contains material that may not be available on all platforms. If you are writing cross-platform applications, it may cause a problem. For example, a unit that uses objects defined in OleAuto might be tagged using the PLATFORM directive

The $WARN UNIT_PLATFORM ON/OFF compiler directive turns on or off all warnings about the platform directive in units where the platform directive is specified.

что означает:

Код:

unit Unit1;

{$WARN UNIT_PLATFORM OFF}

interface

uses
  FileCtrl,