Can I open a text file in Preview from the Terminal?
Preview only works with PDF files and some image files (png, jpg, gif, tiff, bmp) so you won't be able to open a text file on Preview.

To open your info.txt file from terminal you need to choose an application that can open text files, like TextEdit or any other text editor.

You also could use open -e file, to open any file using TextEdit.