You have used a local path from your computer to attach the picture. Unfortuantely, it doesn't work this way because you will need to host the image on an online image hosting website. You can use ImGur for this operation.
Based on my knowledge, I can say that Illustrator doesn't open all the CDR files. Try to open the file in Illustrator CS2 and then export it to PDF. You will have the possibility of opening the file in every Illustrator.
Note: Always save a backup copy of the files in Illustrator to AI. This way you will have the source file to export it to another format when needed.