Help! File opening to "Text Import Options"

Hi! I've got a relatively small illustrator file that when I open with the latest version of Illustrator CC is coming up with "Text Import options" and then it ill open as an empty blank artboard.The file looks like the right size 1,461 KB, but no joy. I've tried some basics like trying to change file extensions, placing the file in illustrator/indesign to export out as an .eps. I've followed a thread about changing AIPrefs to enable context recovery usig postscript but no luck. There's a similar post here suggesting that it might be a missing/corrupt AI header file but I have no idea how to correct or if I can recover it.