Can't open my Corel Draw files

Good day to everyone,

 

I'm sorry if my request is going to sound stupid but the fact is I'm not a professional Corel user and I'm actually not familiar at all with the program and its version history. All I used Corel for is to prepare some schemes for my presentations (I'm an experimental physicist) a couple of years ago. I now need to reuse some of those files but I just cannot successfully open any of them. Everytime I open on of my files all I get is an empty sheet, as if I just clicked "new file". I'm using Corel Draw 12 but I have absolutely no idea what version I used to create my files (I used to work in another university and the software was licensed to them).

I'm attaching one of my files. Could some of you help me out please?

Thank you very much and sorry for being, for the lack of a better term, a Corel total newbie :-)

PP.cdr