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get the windows file type

uses
  ShellAPI;

function MrsGetFileType(const strFilename: string): string;
var
  FileInfo: TSHFileInfo;
begin
  FillChar(FileInfo, SizeOf(FileInfo), #0);
  SHGetFileInfo(PChar(strFilename), 0, FileInfo, SizeOf(FileInfo), SHGFI_TYPENAME);
  Result := FileInfo.szTypeName;
end;

// Example:
procedure TForm1.Button1Click(Sender: TObject);
begin
  ShowMessage('File type is: ' + MrsGetFileType('c:\autoexec.bat'));
end;