Returns a textual description of the current file type and other file format specific properties.
For example, if FileType is ioTIFF and TIFF_Compression is ioTIFF_G4FAX, FileTypeStr returns the string: 'TIFF Bitmap (TIFF) Group 4 Fax'.
if OpenImageEnDialog1.Execute then begin ImageEnView1.IO.LoadFromFile(OpenImageEnDialog1.FileName); ShowMessage( ImageEnView1.IO.Params.FileTypeStr ); end;