Delphi带预览功能的打开文件对话框，如果你要打开 的是文本文件，那么在下边的预览框中将会看到一些此文件的内容，如果是图片，也会看到缩略图，很方便吧？其实Windows系统已具备这种功能，不过还是想用Delphi去实现，因为可以边学边提高嘛。

-Delphi with a preview of the open file dialog box, if you want to open the text file, then the preview box below will see some of the contents of this file, if it is images, will see the thumbnail, it is easy, right? In fact, Windows systems already have this functionality, but still want to use Delphi to realize, because they can learn while improving Well.