The .Ink extension doesn't appear to be a picture. Remember that the very last .something is the real filetype so file.jpg.txt is a text file and file.txt.jpg is an image file.

This site lists the programs that can open .ink files.

If you already know all this but think the attachment should still open, or it works in other browsers please let me know and we'll take it from there.

some email-programs & providers also block .lnk attachments for security purposes... edit: ah sorry, i read it again and it's .ink not .Lnk